My mother visited the other day. I have been decluttering and tidying so while the rooms are all clean and clear, the hallway and landing are currently full of boxes and bags.
Mum said that I need to make dh help me more and that he needs to get to the tip straight after work instead of sitting down and relaxing. 
This is just the most recent in a string of weird comments about him. She has him pegged as lazy and unambitious. It's bizarre.
She once said to my BIL that he should work part time like DH does. Dh works full time plus overtime, he starts at 7 and finishes at 4.30, but because he's home by teatime she think he works pt.
He also has a second 'job' related to his hobby. He was at this job NYE and she lamented how sad it was that he chose not to be with his family that evening. We don't make a big deal of nye anyway and the money was very good.
He earns a great wage in a highly skilled profession. But according to my mother he has no get up and go and no drive. He also has two hobbies that he takes very seriously, he does all the ferrying to and from clubs for the kids, is an equal contributor to housework and parenting. In mum's world he is a lazy man, she thinks we are both layabouts in fact.
I was in hospital recently and got a text from my sister basically slagging DH off and saying he needs to do more to support me. He couldn't be more supportive.
It's like they have a narrative where I'm the family screw up and therefore DH must also be a bit shit, despite overwhelming evidence to the contrary.
Weirdly, my mum is effusive in her praise of my BIL, who is lovely but works a manual job and spends every weekend in the pub, and is a recovering cokehead. The whole thing does my head in.
I've already pulled back quite a lot on how much we see them and how much I tell them. But I don't know how else to deal with this other than just laugh in their faces every time they say something batshit.