My husband is historically crap at thanking people for gifts/ cards.
We have two children and every time his family send my daughter or son a gift/ card my father in law messages me to ask me to thank them or to ask my husband to thank them because "he's no good at doing that kind of thing.
Whilst I'm grateful for their efforts I do feel this is my husband's responsibility as it is his family and I have enough mental load I carry.
Would I be unreasonable to reply saying I'd appreciate it if he communicated with my husband directly about this kind of thing as I have enough to remember/ do without having to remind him to do his own jobs.