I haven’t even been able to make a phone call to them You are able to call, it just feels awkward to you. You can try sending them an email or a text to arrange a time to call. It will feel less awkward.
In subreddit r/RedditForGrownups
In a post titled:
I've been the black sheep of my family for years and actually haven't had much contact with them for five years. How to reestablish connection with family?