My mom and I have a very strange relationship - we do not hug or show any affection to each other, the first time I recall my mom every saying "I love you" to me was when I was 29.
My family is beyond dysfunctional, but ... here's the but ...
When my kids came along, I know I suddenly realised what physical affection was - I hug, cuddle, kiss, and am always touching my kids.
My mom is also very affectionate to my kids - she often says she loves them, hugs them,kisses them and gives them the affection I think - for what ever reason - she could not show her own kids.
Kids do change the dynamics, and your DH's family may surprise you, and shift if a grandchild is introduced.
My partner's family is more affectionate then mine, but we have both realised that we are by far more affectionate and more verbally affectionate with our kids, than we were shown when we were growing up.