1) YES she will bond with him (that's a good thing, the more people in his life he loves who love him)
2) NO that won't erase his bond with you (will you stop loving him when you have your 2nd? The human heart swells, not diminishes)
3) YES you may have a day or two of difficulty getting back with your routine (I've left my kiddo for up to a couple weeks with my mum.... always takes 1-2 days for us to get back in the groove, but the same is true if I take him with me, because traveling rules and routines are different than home routines)
4) But NO, it does not mean that you won't be able to return to your routine
Kids are resilient creatures. I let my toddler jump on the couch. Did that mean he jumped on EVERYONE'S couch? Nope. "Different Rules". Kids can and do adjust to different rules and different routines fairly easily. At school kids raise their hands to talk. Does that mean at home they can't talk without raising their hands? Nope. They adjust. The same is true with rules at different houses. You just make it clear.