I missed the competitive question, sorry. Mine all do very different things, and we obviously encourage them to be individuals. As it is, we would have bugger all luck in trying to shoe-horn them into the same things as dd2 has cerebral palsy. With the best will in the world, she ain't no ballerina or basketball player. We encourage her to keep up swimming and dance at a recreational level - it's great to keep her body moving and negates the need to attend physio sessions. She has her own sport that she loves and is involved with an adaptive group for lessons (that's where she was all day yesterday) and is in fact disappearing off in two weeks to compete with them for the first time. She's also on the school debate team and has evening and weekend practise and tournaments.
Dd1 is in a synthetic biology team
, dances every night and teaches tap, and has just finished her life guarding qualifications.
Ds1 is the basketball fan, but has a very different personality to the girls and would actually be much happier left in his bedroom with his Lego, mine craft, games and Magic The Gathering cards. He goes to a social Magic group once a week.
The girls are both in guiding as well (different units) -ds gave up scouting a couple of years ago.
There really isn't any competition - Although I did have dd1 in tears once over a spelling competition at school, as ds1 (2 years younger) knew how to spell broccoli and she didn't. So I suppose school could be inculcating competition between siblings? Extra-curriculars aren't, anyway...
As an aside to your experience - I didn't do any extra-curriculars as a child either (except brownies) and spent the rest of the time with my sister (who is lovely). We probably speak on the phone twice a year and occasionally fab message. I haven't seen her for seven years. Spending time with your siblings as a child is really no reliable indicator of any future relationships, tbh. These things change over time, and it would be just as likely for folk who barely saw each other as kids to become closer as adults.
Fwiw, given the many many many hours of time together we had as children, my sister and I used them to create clubs of our own, of many different types, and invite the local neighbourhood kids to come and play. (We would develop specific activities and set membership badges etc) In hindsight while we are chatting are now, maybe that was a sign we could have been kids who enjoyed doing more? In any case, it wasn't an option and certainly didn't ruin my life lol. We barely saw our parents. I know by the time we were teens we REALLY needed to stretch our wings and spend time with other people. We are still 'close', but not physically.