AITA for keeping the cash back I made from a shared purchase for myself?

Last year my siblings and I had to make a shared purchase. It was the cost to bury our father after he passed away. We split the payments 4 ways between all of us. They sent me the money and I put the cost of the burial on my credit card. With that, I made about $140 in cash back.

This weekend we were hanging out and talking about finances in general. I talked about how I put everything I can my credit card to get cash back and because it has better protections than a debit card. That way I am getting some money back on purchases I need to make and if something goes wrong, I have better ways to defend myself. Plus I just love cash back!

My sister asked if I really meant that I put everything on my credit card. I said yes, the only exception is loans where credit card payments aren’t accepted. Otherwise it goes on the credit card. She asked me about our father’s burial. I said yes, since they accepted credit cards, I did it. She asked how much I got back from that. I told her it was about $140. She asked why I didn’t send her “her portion” of the cash back. Eventually my other siblings agreed that I should’ve given them some of the cash back I received from putting the cost of the burial on my card. Their argument is that they gave me the money to pay for part of it so they should get some return.

We were having drinks when this came up so I thought maybe the drinks exacerbated the issue but this happened Friday night and when I texted my brother (not the one who brought up conflict at first) about something unrelated, he asked about cash back. So he still expects me to give him “his portion” even though he didn’t have a problem with it until my sister brought it up and kept pushing the issue.

AITA for keeping the cash back I made after making a shared purchase?