Make friends on Nintendo switch?

So my family and I share the switch, i.e. There are multiple accounts on the switch. I wanted to play a few friends, so I wanted to link them to their accounts. Is that so that my friends automatically connect with the other accounts e.g. Link my brother or is it then separated?

So, if you make friends with someone on your account, only that account is friends with the person.

Okay thank you.