Yep
It's quite rife in my family
Both maternal grandparents had strong indications of ASD;it'd certainly explain a lot.
My mums sister was diagnosed in her 50's with ASD and her eldest daughter in her 30's.4 of my aunts grandchildren have been diagnosed.
My own brother was diagnosed in his teens,myself and my mum think my dad also has strong ASD traits too.My niece (other sibling) child has just been diagnosed at age 9.
I've 2 children with ASD one diagnosed at aged 2 or the other is 15 and currently undiagnosed;she's a girl,she's highly intelligent,excels massively academically and is mature and well articulated;trying to get help for her is like getting blood out of a stone because she doesn't fit the normal profile.
My DH is currently on a waiting list for a adult assessment for ASD/ADHD.
On his side his nephew has ASD.We also think upon reflection that my late MIL was likely on the spectrum too.
Sorry for a long rambling post but there's proof it's most likely genetic.
Given the family history my own children if they decide to have a family will need to take into account there's a very strong possibility of having a child themselves with ASD.