Not sure what platform your dad or brother were on but you are probably going to make a hell of a lot of more difference in the MQ-9 than 95% chance they did in their MWS. When I begrudgingly TAMI 21d to the MQ-9 as a non vul it was at the horizon of the war in Syria. For a 3 month period, 75% of all munitions dropped in CENTCOM came from an MQ-9. We were extraordinarily kinetic and because we didn't go home after a 4 month rotation we developed more SA on the ground campaign than any other flying community. The assignment opened doors for me I would have never had in my manned community and I was offered positions in SOCOM, the Pentagon, and other communities. The assignment ended up becoming an apex of my career and when I went to staff I carried a lot of credibility for my time in MQ-9s, not so much my time in other aircraft.
I would advise you life is full of dissapointment and failing to meet goals becomes a regular event. Frequently we tend to look at the Johnny Kim's in life and compare ourselves, leaving us to feel short or inadequate. The truth is we often can't control the circumstances that bring us to our outcomes and while there is no doubt more you could have done to reach your goal of being a pilot you must recognize a lot is contributed to luck and timing as well. A well known base ops'er used to say "grow where you are planted" and that advice, personally, helped me thrive. I found new interest I didn't know I had and quickly became an expert in areas most chose to ignore. But it brought me new oppurtunities and new successes.
You'll find as you get older that success becomes more about the people you've surrounded yourself with than what you have achieved or accomplished. Whereever you go, hold good character, be a loyal friend, and help others out. You will quickly find that you feel more fulfillment in this manner than you do by overly stressing to meet arbitrary goals you set for yourself. That doesn't mean you should quit or end your pursuit to be a pilot, but realise it is not necessary to attain fulfillment. If your family can't recognize that, ditch them. Do not keep people in your life that drain your spirit.
If you want more advice or mentoring, PM me and I'll give you my work email to reach out to. I spent 4 years in MQ-9s and loved the community. They took care of me, gave me chances other communities didn't, and I will never talk down on them.