It's not the same thing.
the Eldest is being brought up with the OP's DH as her SD, effectively her Dad, there every day & the youngest has nothing to do with the eldests Father. He's a stranger that picks up the eldest 1 or 2 times a year.
@ThatRubyMoose
so for all these years you've been buying her &/or her children Christmas presents, she doesn't reciprocate (which you were fine with) but she takes SIL MIL & the children out for a treat, but has forget least 5 years just ignored your daughters.
unacceptable. If I were her I'd buy babies/toddlers a gift (I know she doesn't reciprocate as she doesn't 'do' gifts, but surely a baby/ toddler could be an exception!
your eldest should have been included in the 'treat' as soon as you & DD started living together. You and DD are DH's family, she's 1 child, they've excluded all these years (not several who would have each other & not feel the exclusion so much).
If she can afford to pay for two adults (at least) & several children, then adding one child isn't unaffordable.
I think it would be quite awkward to start including her now just because the youngest is old enough to be included, they didn't want her going before.
just keep doing whatever done all previous years with DD1or something else she would love to do.
But they're bitches not to have included her from the beginning, made her feel part of the family, I don't understand how people can be so bloody insentive & hurtful to a small child..
which slippery slope does MIL think this is going down exactly?? & what did the big wet wipe say to her.??
.
i don't think you can really say or do anything because even if they did start to include her you'd know it was under duress, not because they want to. and given you explained why DD2 can't go and all she said was 'that's a shame'. She could have said 'of course she should come if she'd like to!'
DH should have sorted this out with his family's long, long time ago. Not be saying it's ok to treat the little one now & exclude the youngest. Does he treat DD1 as his own??
These type of people are an enigma to me - thank god.