I'm sorry bud. I know how bad it sucks to have your family keep misgendering you even when you're out and have been transitioning for a while. It took my mom several years, about 5 actually, to really see me for the guy I am. It wasn't until I got on T that I was able to tell the rest of my family the situation. She didn't want them to know and also didn't want me to come out to anyone.
After a year or so of her misgendering me, we finally made a compromise. Whenever she was around me or when we were out together, she wouldn't use any pronouns at all, call me by any name (she still couldn't say my masculine nickname), or call me her daughter. This worked for a long time, a couple years. Eventually I got her to start using my nickname, here and there, when I became "stealth" at uni, 5 years since I started transitioning. Still, she had a hard time saying "he". Later that school year when I got on T, she finally made the switch. Now she calls me my nickname and uses masculine pronouns all the time.
Sometimes it just takes time, patience, and compromise. I know that sucks, believe me I know. In the beginning, I wanted or had none of that. Over the years though I was able to develop it and surround myself with people who saw me for me. Keep trying with your parents but realize it may take them longer to come around.