Welcome to A2K to KeeKee
What Tsar and t'others said above... all that - yeppers.
My brother has a little boy from his marriage and has a partner who has 2 older children. They've been partners for ....hmmmmmm.... about 8 years now and his partners son is 19 and her daughter has just turned 15.
My parents weren't entirely sure how they should treat J&H when my brother and partner got together - but they would always make them welcome, give them sweets and treats the same as their grandson and my children (they live less than 2 minutes away from my parents).
The children were disciplined differently by their mother to how my brother disciplined his own child... but as time went on and the family dynamics came together - it came to a united front on most things. My parents had to do the same - the children were all treated equally. If my little nephew and niece got into trouble... which they often were with my parents <love those naughty kids>
- they were treated identically.
My brother hasn't remarried - but his partners children are certainly their grandchildren, they are my niece and nephew and they are my childrens cousins. We're not blood tho but they are treated as family.
My nephew is obviously an adult now and he has a further extended family so tho he's still at my brothers house, he does his thing. I don't think my parents worry about the teenage antics that he gets up to quite as much as they worried about my teenage son's antics. I don't worry about J the same way as I would worry about my little nephew - he's a grown up lad and working and I rarely see him - he's still family tho.
My niece who is just 15 has a brain tumour - they worry about her the same as they would worry if one of my kids had a brain tumour. I am very close to my niece - I probably worry more about her than my little nephew and I love him with everything in me.
So, in saying all that - being "biological"... well, I believe that it would be better for your daughter if you could find it in your heart to accept and welcome these children into the family. You would not be expected to love them immediately - gosh, you may not even like them.... and I do agree that this could be very dependent upon their age - if they are littllies - I do hope you would be able to treat them the same - even if you don't feel the same way towards them.
It also depends on their circumstances - if they are older and have bio grandparents already... they don't necessarily want a new "grandma". A little respect all around I believe would be in order.
I wish you well - it can be difficult when families comes together. Please do try and give the children a chance. If you don't wish to look after them or have them forced upon you, then you really do need to talk to your daughter about this - this is not the children's decision and if you're aware you are going to stuggle having them around - that would be quite unfair on the kids.
Once again - you are not expected to love these children at the drop of a hat. That comes in time. Give it a little time and watch the children grow.
They are children... grand or not.