We've just had DP's mum to stay for 4 nights. I don't live with DP, but I have a house whereas he lives in a 1 bed apartment so it makes sense for her to come here and stay with me, him and my 2dc's. I love having people to stay, but just find her totally and utterly draining, a complete black hole of negativity.
She has had some really horrible things to deal with in life - widowed with small dc's, serious (life threatening) illness with one of her dc's and an abusive ex partner. I've also had my fair share of stress to deal with, (who hasn't) and feel a good deal of sympathy for her.
However, she is just so bitter and mean, it's awful to be around. She constantly snipes about other people's weight, income, whatever. Today she bitched because we went out for lunch and a lady in a wheelchair didn't offer to move seats so we could all sit together 
Her default expression seems to permanently be on the verge of a moan or sulk. She is penny pinching, and in return for spending 4 nights at my house has given my dc's a bag of sweets to share, complete with reduced price sticker. She didn't offer once to help with anything, or contribute in any way at all and was actually sniggering at me for (literally) running round trying to get everyone else's dinner ready one evening after I'd got home from work. If we go to a cafe, she hangs back so I pay for her coffee. This got on my nerves yesterday, and I just ordered one for myself, but felt horrible about it.
DP gets it, and has slipped me money to cover her share of food for the last few days but becomes very upset or defensive if I try to broach the subject of her behaviour. I know he feels loyal to her, and also feels guilty that he doesn't see her more. I know she's lonely, and I feel really sorry for her because of that, but she just won't accept any help, and seems to have alienated most of her friends and siblings over the years. We've suggested all sorts, encouraged her hobbies, DP took her abroad on holiday this year and offered to help her redecorate her home. Tbh I'd probably even give her money if I felt it would genuinely help - anything she gets just goes on more clutter for a home which is already bursting at the seams.
I could go on, but won't or it could turn into an epic. Bottom line is I just can't make myself like her. I don't want her around me, or staying here again. She cannot bring herself to say anything nice about me or my home (which I'd made really welcoming for her) I actually feel as though she's taken advantage of me this time for a free holiday. 