I think it’s odd that posters like yourself assume that not having family around the first few days after birth means it prevents bonding.
My in-laws were the first to meet our oldest when he was six days old (live 4+ hours from us) while my mother didn’t meet him until he was six weeks old (parents live in the States). With the second, it was two weeks due to the behaviour of my in-laws with the first (stayed with us in our one bathroom home, and expected me to host them while recovering from a traumatic labour, birth and emcs, including moaning about how long I was taking in the bathroom because supposedly it should only take me five minutes total to shower, use the loo, and do injections while still heavily bleeding and in pain), with my mother coming after the two weeks and us going up to visit the DH’s side after her visit.
DH’s family all got a cuddle and a hold and I didn’t have to worry about trying to make it up the stairs to nurse in private while in pain from an episiotomy done without my knowledge (couldn’t even walk a full block the first week and it was close to week 4, I was able to sit without pain) and bleeding all over DH’s parents furniture (bled for 10 weeks, and by time we visited them it was a light period). My father didn’t meet the oldest til he was almost one and our second until he was 5 months old due to not being able to fly at the time.
My in-laws see our children much more in person than my parents due to being in the same country as us but guess who has more of a bond with them?
My parents because they continuously put the effort in compared to DH’s parents. My parents may be in a different country, but almost every week for eight years they have video called to see and talk to our children (8,5). When we have visited them and them us, they spend as much time as possible with them and have a laundry list of age-appropriate things they want to do with them. My in-laws video call 2-3x a week and their focus is on DH. They’ll ask after the boys but they don’t engage with them much. They engage with them somewhat when they visit us for the boys’ birthdays but it’s the bare minimum to the point I question if they come to actually see the boys or to be hosted by DH, offload their issues with his siblings to him and head back to make out as them being involved grandparents to all of their grandchildren.
Effort usually trumps simple presence and showing up to cuddle a newborn baby who doesn’t know or has any thought or care who you are is not going to create an instant bond.