I am 31 (married with a toddler), and my two younger sisters are 29 (married no kids) and 24 (single).
For ease of describing, 29 year old is called Allie and and 24 year old is Rebecca.
Rebecca still lives with my mum and me and DH and DC were visiting the other day. She casually asked if we'd like to join her on her trip to Toronto. I said that would be fun, (I didn't say this part) but especially because she has historically never really bothered about going on holiday with me or Allie and we have always tried to organise a sibling holiday. And then I heard Rebecca tell my mum she was going to coincide it while Allie is there for work.
When I saw Allie the day after I said we (DH and DC) were thinking of taking our first holiday with DC to Toronto too. She laughed and said to stay at Rebecca's hotel. But then changed subject. (Rebecca and Allie are staying at different hotels because they can't afford the same place).
DH thinks Allie didn't realise I was serious about going to Toronto with them but I feel like Allie just doesn't want me there.
AIBU to ask Allie again if we can join them on the holiday?
Both Allie and Rebecca dote on DC, Allie is always buying DC new toys and clothes (to the tune of spending maybe £200 a month on her, but that's a different issue)
As an aside, I feel so alone now as a new mum and that people view me differently. Before being married and having DC, Allie and I were always trying to get Rebecca to come on holiday with us and suddenly they've planned a whole trip and haven't even mentioned it to me.
Edit to add: I also don't want to go if they don't me to go obviously. I don't want to make them feel obligated to HAVE to invite me and I also don't want to feel like a burden.