Not that I care really, what you think, but I do know.
I know they don't pay into a pension. We have recently had a long discussion about this.
I know they don't have private medical care.
And I know they have no debts.
No idea about tax deductions though, you got me there.
I don't know why you think these aren't normal conversations to have with siblings. Maybe they aren't, I don't know. We've had them though. And I could tell you almost all the same facts about my own sister and her wife.
I'm not unhealthily obsessed, by any stretch! They tell me everything, hence I know it all. I do not enquire. I do not, particularly, care.
I care that they tell me, then complain to me about being poor. When they know our circumstances as we they.