How old is Sophie's eldest? 9? If she follows in her mum and nans footsteps Sue could be a great grandmother in 10 or so years, Heidie could be a great auntie before she's a teenager
In 20 years Sue will have countless grandkids and great grandkids. Imagine having Sue and Noel as grandparents or great grandparents. You wouldn't get spoiled or doted on because they're busy with your baby uncles and aunties. Your "older" uncles and aunties might as well be your cousins.
Imagine being Chris and looking at Heidie knowing she is his full blooded sister, raised by the same parents, yet their lives couldn't be more different. I come from a family with weird age differences, with an aunty younger than me, but nothing like the radfords. They're going to have a bloody hard time drawing their family tree at school.