Well maybe it's changed in 10 years but we did sex education when we were 10 so logically all of them had learnt it, but I'd say it's her fault too, not so much for not educating them but not knowing they were having sex at that age and talking to them about it. Obviously the 16 year old is legally able to have sex and thus entitled to get pregnant but her mother does still have a legal obligation to her until she is 18 I think.