I was talking to a girlfriend at the weekend and her mum is poorly (nothing serious). My friend was saying how she'd love to be able to just pop in and see her, make her a cup of tea, bring her a treat, just generally be able to show her mum how much she cares and how much she loves her. This is her adoptive mum - her biological mum gave her up when she was a baby because she had life plans and a baby wasn't in them, and they've never seen each other since (my friend has no intention of tracking her biological mum down - as far as she's concerned she has a mum - and a dad).
I, on the other hand, have never been close to my mum and we rarely speak. I grew up admiring a friend's mum though in the way she was with my friend, with me, with our friends, with her husband, her friends, her colleagues, etc. We are still close to this day.
So that got me thinking: is bloody really thicker than water? I don't think so. At the end of the day your DP/spouse, for example, is not a blood relation and yet many of us are much closer to them and love them more than blood relations, even siblings. Many of us make friends we love more than family. I certainly have a few of those and we speak nearly every day and see each other a lot (respecting Covid-rules atm I feel I must say).
And long lost siblings for example: would you automatically get very close and care for them very much if you met them, just because they are related to you by blood?
Curious as to what others think.