Is my boyfriend too close with his little sister?

We are both 20 and his sister is 8 years old, but I think that he spoil her too much. She just have to ask for something and he immediately grape his wallet and pay for it. She’s very adorable and polite, but I find it annoying how he always want to pay for everything she asks for, wether it’s a toy, cake or cloths.

Yesterday we were both on a date and he bought her a 60 euros coat, just because she asked for a new one.

And he sometimes even bring her home, whenever she ask for, so she may spend the week end with us.
We are very close and intimate but I feel that he love his sister too much, just because he told me that he always wanted a sibling and she was born the same year he wished to have one.

Isn’t it toxic to be that close with your sibling? I am an only child so I don’t truly know how brothers and sisters truly interact but I find it weird how he spoil her so much.
Is my boyfriend too close with his little sister?
Is my boyfriend too close with his little sister?
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