Hi S.,
No I don't think you are being unreasonable. I've only been married 2 years. However, my husband was never required to do housework or dishes growing up - his mother took care of everything. Hence, when we 1st starting dating & getting serious, I had my work cut out for me.
When I would comment to my mom about some of the things he wasn't doing around the house, she would would tell me that my dad doesn't do that either. (My dad does fix things & help with the outdoor chores - but scrub a bathtub...no way!) She's from a different era where the women still took care of the house, kids & full time job & that's the way it is so I shouldn't expect much. I tell her that I am not going to live like that & make my life more difficult than it has to be. I tell her that I can't help it if she didn't "train" dad to do things.
Anyway, I am fortunate, as my husband has beome helpful over the years. I cook, he cleans up. He's not very handy & has a low patience level with projects & I am the opposite (Heck, I buy or pick out the tools!) I do have him do chores on his day off during the week (he works retail). He does scrub the tub (more muscle power & the cleaning agents aggravate my asthma). He vacuums & does laundry, but I do have to remind him. When he complains that it is his day off, I remind him what my Saturdays are spent doing - going to Walmart & grocery shopping & other cleaning that he doesn't do. The more we get done on our days off, the more time we can spend together doing fun things on Sundays, our only day off together.
It's not always easy & not everything always gets done. It take a lot of patience & balancing. There is only gong to be more stuff once the baby is born. My hubby likes the praise too. I always try to notice what he's done in the house & say thank you before he can ask me if I've noticed.
Try to make a list of things/chores you know he's good at & post it on the fridge (as well as your chores). Incorporate your children on this list if they are old enough simple things like making their bed or putting away their toys. Maybe with being ADHD, he needs the structure? If the whole family is on the list, he won't feel singled out. Good luck to you!