I like my in-laws. But having invited them to spend christmas with us a while ago, she announced that no, she could never possibly leave SIL and her kids at christmas, That christmas just wouldn't be the same without her grandchildren (insert shocked face at me ever proposing such a thing)
So as not to drip feed. They're retired, active and mobile and only live in NI so a short, cheap plane ride away.
SIL would never come and has only ever visited us here once/twice in 20+ years regardless of countless invites extended to her and her family. We're very fond of the Nieces/nephews too.
We can't go to them due to DH's shift work. We did it one year and it was just a f*cking nightmare trying to sort the kids, take all the presents and get time off work.
SIL has now moved away and remarried and lives an hour away from them as opposed to
Round the corner. Due to blended family there isn't enough room for the PIL for christmas anymore and PIL house isn't big enough to host 9 for dinner.
They now spend christmas alone. They visit us once a year and spend the entire time christmas shopping for the 'grandkids' (all grown up and moved out/away) at home.
I won't have our children realising they're not as important as the other set of grandkids so the invitation will never be extended again.
Sadly DH agrees and we just don't bother. Their loss 