I'm expecting my first child soon so I am building it for me and my family first but if it solves a problem for me, maybe others will like it!
The basic idea is that you are uploading a curated set of photos you want to share, not your whole camera roll.
You can create one or several family groups that you can share individual photos or albums to. Members of those family groups can view, comment on, like, etc those photos.
You can also generate sharable links for people who don't have an account with a configurable expiry time.
It currently more or less works on the web but I am also working on iOS and Android apps since that is how my extended family would want to interact with it.
I'm not quite ready to launch it to the public but if anybody is interested in trying it out or offering feedback I can privately share it :)