is it odd my fiancé is always on the phone with his sister for HOURS

It didn’t bother me at first but almost every other day my fiancé calls his sister and they sit otp for hours. He’s been on the phone with her since we woke up at 9am, it’s now 1:42 PM. My TWIN brother and I have a very close relationship but we never spend hours on the phone with each other- maybe 30 minutes to a hour?

I asked him jokingly could he get off the phone so we could talk and he told me I was “jealous” and said “is it a problem with me being on the phone” I told him no but they have been on the phone basically all morning and this afternoon. He calls me weird.