A guy calls me “sister” but his actions say differently. So, does he actually think of me as a sister?

This guy (26) who is my best friend’s brother always say/refer me as a sister. He takes care of me whenever I visit their place: from going and buying groceries with me and for me, getting stuff animals I said looked cute, pay for my food, get me flowers for Valentine’s, take me to church, getting me lots of Christmas gifts, helping me with my car issues (check the oil levels and going to the store and helping me pick the right one for me car), giving me hugs and sometimes sitting on me to just make me feel annoyed, to saying that whoever marries me in the future will be very lucky. He never say anything regarding his feelings and would never text me. Could he potentially like me or am I overthinking this whole thing? He isn’t much of a talker when it comes to how he feels…

A guy calls me “sister” but his actions say differently. So, does he actually think of me as a sister?
Post Opinion