Have you ever visited a town and not seen a close relative who lives there?

Two of my brothers recently visited our hometown and neither contacted my sister who still lives there. This makes me sad for my sister and makes me wonder why they would avoid seeing her. None of us are estranged from each other and neither of my brothers has issues with this sister. I am fairly sure it did not have to do with time constraints during their visits. Have you done this? If so what was your motivation?

As an aside one brother actually happened into my sister’s daughter during their trip so my sister has found out they were in town an didn’t contact her. I know it hurts her and really bums me out.