Special Grandparent time?

We just found out that my sister is 12 weeks pregnant. I am 25 weeks pregnant. We are both first time moms. While I am totally overjoyed and excited that the kids will be so close together, I do have 1 concern. My sister is known for taking advantage of my parents kindness and will no doubt do so in a trying time like having a new baby. There's nothing I can do about that but I don't want my child to have less of a bond with her grandparents. When she becomes a toddler, special time together will be easier I think as I can plan fun things, but any ideas how to make special time when she is a baby? I just want them to bond despite the fact that my child won't get as much time with them because I'm not willing to ditch my kid on them.