Duncan is a successful architect with a thriving private practice, in addition to being the presenter and producer of EcoEye and prime-time series, About the House. He had a near-fatal accident when visiting the site of the Chernobyl accident in October 2003, when he fell from a tree, but has happily recovered well. Duncan is married to Agneta, and has five children, Oscar (26), Marcus (25), Tania (23), Allan (20) and Stefan (12).

Tania is an accomplished singer, actress and presenter. She completed several courses with the Gaiety School of Acting, and studied theatre performance in college. She has appeared in short films, and has a nine-month-old baby, Joshua Oliver.

Duncan on Tania Tania was our third child, and she's the only girl, which makes her a bit special.

She was really cute as a child, and was always rescuing spiders and saving snails from being run over. She'd be very concerned if she saw anyone harming a little fly or any type of creature.

I see a lot of myself in Tania, and we'd be very alike in ways, good and bad! She's really very artistic and is always sketching and drawing. Tania has a great personality . . . she's really outgoing and has always been a breath of fresh air. When I had my accident, she was one of the people who kept my spirits up, because she has a fantastic ability to brighten up the place . . .she's like a ray of sunshine coming out from behind a cloud.

After Tania had her baby nine months ago, she was diagnosed with Hodgkin's disease, and the news came as a total shock to us all. She's only 23, and I couldn't even imagine her being ill like that, and we didn't know what the outcome was going to be, at first. Tania was so positive and courageous through her six months of treatment, and she always looked on the good side and just got on with things. Her doctors were very reassuring, and they said that the type of cancer she had was very curable if caught in time, and thankfully she's well now.

Tania is a fantastic mother, and she's totally devoted to Joshua Oliver. When she was ill, she focused on the baby all the way through it, which I think was a good diversion for her. She's always singing to him, and it's lovely to hear.

We were looking for a young female presenter for EcoEye, and Tania fitted the bill. She is passionate about the environment, and has also done some television work in the past. I thought it would be a great boost to her after being ill, but of course I was worried at the beginning about being biased, and that having Tania working on my show would be nepotism really. But I was delighted because the reaction to her presenting has been great, which is lovely to hear.

I think she'd be a great presenter for young people's programmes, because she has a lovely way with children and young people, and they all gravitate to her in a room. She has been through a lot in some ways, and she's still only growing up really.

I'm very proud of Tania and she's very special, although I wouldn't be going around telling her nice things when I see her. We're always bantering with each other, and I'd be slagging her about dossing and things like that.

Tania on Duncan When we were children, Dad worked really hard, between his own work, his TV work and lecturing in Bolton Street. If he was away down the country, as soon as he came home, we'd be swinging out of his legs because we'd be so excited. Mum was the protective worrier, and my dad wasn't strict at all. We used to go down the country every Sunday and Dad always did mad things with us. He was a really fun dad, and he'd be throwing us around the place, or jumping into the sea with us. As I got into my teenage years, I think my brother Marcus almost took over the 'worrying father' role, because my dad wasn't like that at all. . . he was always very chilled out.

I went through a phase in my early teens where I was embarrassed by my dad.

People were always stopping him and coming up to him the whole time when we were out. He's so nice and giving with his time, but it was bit annoying for the rest of us. As I got older. I started to realise that I'm actually very like him. I have four brothers, but l'm actually the most like dad.

When Dad has his accident in Belarus, it was a really horrible time. We were all so worried, and it was really scary and confusing in the first few days, because the phone system was really bad and some of the papers were saying he was on his death bed. My uncle Erkus and brother Marcus went over, and Dad was airlifted back to St Vincent's, which was such a relief. As he got better, he was gas, because even though he could hardly walk and wasn't supposed to leave the ward, he'd get bored and would disappear off exploring.

When you'd eventually find him, he'd be walking up the corridor in the middle of a bunch of people, entertaining them.

Dad's really spontaneous, easy-going and interesting, and he's very different to any of my friends' dads. He was brilliant for getting out of bed at four o'clock in the morning, and coming to pick me and my friends up! It's been great working with him on EcoEye, and I'm passionate about environmental issues too, because Dad brought us all up to be that way. We learned to be very appreciative of nature, and Dad was always teaching us about how important it is to look after the environment.

When I got Hodgkin's disease, Dad was a great support, but my cancer was very treatable. Even though we have both had serious illnesses, Dad and I feel that we are very lucky, in comparison to the other poor people who have terrible lives, such as those living in Belarus.