Judging a Spouse by Family Background?

I hope this finds you all in good health and imaan. Some of you may have seen my earlier post, but I'll give the full background for context. The Background: During Umrah earlier this year, I made a very sincere and specific dua, asking Allah ﷻ to bless me with a pious spouse from among those present in those sacred places. There was a girl in our tourist group whom I never spoke to during the entire trip. After returning, she appeared again , working on the same floor as me at the office. The coincidence felt almost surreal. Eventually, she approached me and shared that during Umrah, whenever she made dua for a righteous spouse, my face would come to her mind. She felt our meeting again was a sign. We began talking online with marriage intention. In terms of deen and character, I found no red flags whatsoever, she prays, recites Quran regularly, and has strong faith in Allah. She is someone I genuinely respect. However, I ended the connection after about a month due to religious guilt (no mahram involvement, private conversations) and my mother's practical advice that I wasn't financially ready. She was heartbroken, and I carried guilt about it. But , we eventually resumed talking, and my confidence in her personally has only grown stronger. The New Concern: Recently, her brothers social media profile that was previously private became public. What I saw genuinely concerned me , content suggesting a lifestyle very far from Islamic values, a non-Muslim girlfriend, trips with her, alcohol, and so on. Now I find myself asking: Does this reflect the family's overall environment and values? Does the family practice Islam, or is she the exception in a non-practicing household? She herself shows every sign of being deeply religious , but how much does family background matter when the person herself is clearly practicing? Is it fair to hold her brother's choices against her, or is this a legitimate concern about family compatibility? I'm not doubting her deen at all. But I know that family background, values, and the environment a person comes from matter deeply in a marriage, not just the individual. Has anyone navigated something similar? How do I find out more about the family respectfully? And how much weight should a sibling's lifestyle carry in a decision like this? Jazakum Allahu khairan for any sincere advice.