Not entirely sure what the AIBU is but I want to avoid BU..
Our son is married to a lovely lady who has 1 older teenager that has no relationship with their Dad but is very close to all 4 Grandparents. Then 2 younger kids with their first husband who have a amicable shared custody arrangement and again, these kids have a close relationship with all 4 Grandparents.
DH and I love them all and always make sure to treat the kids whilst being mindful not to tread on toes as we aren't their Grandparents. I see our role as more like special aunts/uncles in the shadows that will always be there for them.
Now here is my AIBU, DS and DIL are having a baby soon, their first child together. As this will be a Grandchild for us, we want to help out with buying the pram, high chair (basically whatever they would like us to buy) and when the time comes, babysitting, treat days to the beach etc. I have wonderful memories of my Grandma and would love to create similar memories for new Grandchild to cherish when I'm long gone!
I would hate the other children to feel we are treating their half sibling more favourably though even though they have their own set of 4 Grandparents. Is there a general etiquette? How do to I tread this minefield as I would never want to cause animosity but also want to be able to ensure the new baby has his own set of 4 Grandparents like the other kids do.
How do other Mumsnetters handle this?