About 5 years ago we moved into the area where my husband's dad and stepmother live. (Not strictly because of them, but we like the area and get on well). Before we had our son they would invite us nearly every Sunday for Sunday lunch either to theirs or to a restaurant, when we had our son I used to pop by every week (of course asked beforehand) but invitations at the weekend became a bit less. Now, we're maybe invitee over once every three months for dinner, we see them I would say every other week and we do the inviting. They do gladly accept our invites and we have a nice time when they are here, however I find this drop off of invites on their side a bit of a shame as nothing at all has happened to make them cross or distant. If this was my parents I'd be over every few days and they'd constantly offer to have my son over.... Is this because they've aged? Are we supposed to the inviting now? I'd like to politely bring this up but then I'm not British and afraid it would come across the wrong way/ be too intrusive/ be a cultural thing. Please help!