Long story short SIL and I do not have the best relationship. At best it can be awkward. It predominantly stems from a visit to our home a few years ago where she said to me that it was very evident her brother (DH) was sexually frustrated and questionned if I understood men "had needs." Her 6 year old child at the time also commented that I didn't feed DD properly. Since then, I have always side stepped her somewhat, don't go out of my way to initiate messages etc and I've never really forgotten or forgiven what she said. DH said it was not a good time for her as shortly after her marriage broke up.
So school holidays cropped up. MIL and FIL asked if they could come and stay for a week with us in the summer. No objections as they live 7 hours away and don't get much of an opportunity to have some 1:1 time with DD. SIL and nephew have been living with them for the past 3 years so MIL often feels she doesn't get the opportunity to have special time as a result. I asked DH to query that it would just be MIL and FIL coming and not the whole entourage - single BIL, SIL and nephew. He confirmed that it would not. 30 minutes later DH receives a text message from SIL asking if she can also come down (alternative week to MIL) to do the same. It would also be a holiday for her and nephew. I feel a bit hoodwinked after agreeing to MIL and FIL. I've reluctantly said yes, but am I being ungrateful in that she would be providing a week of childcare? I would still be working, but was planning to use the local holiday club. I have said to DH that I don't want their visits to be 2 consecutive weeks. When DH's family visit we tend to argue as I find it all a bit much. So am I ungrateful re SIL visit and being petty over what has been said and gone on in the past?