When I was pretty young my dad taught me how to recognize when I was dreaming and how to use that knowledge to affect my dreams. I didn't really care at the time, he was way into it though.
After he died, it was really hard for me when he visited, until I remembered what he'd taught me. When I finally told him he was dead during one of his visits he just said "I know" and it completely changed the dynamic of his visits. That was many years ago, I'm almost as old as he was when he passed. Now, when he visits we just hang out and enjoy each others company. I get to tell him about his grandchildren he never got meet and he gives me advice or at least listens to my struggles. I don't know if the dream version of him is real or not (I choose to believe it is), but it doesn't matter. Dad dreams went from being my worst dreams to my absolutely best dreams.
I'm sorry if you lost someone, and I'm sorry if it hurts. Please know that some day you may come to cherish seeing then in your dreams.
I got them a lot in the beginning, and less now 6.5 years later. I'm not a fully lucid dreamer but I have some awareness. I'm always so relieved when I see my dad again. In the beginning it was both happy and stressful, especially before we knew his cause of death (took months and months to get the report) and I felt like I had to warn him about everything. I hope to be aware enough of a dream to interact with him more deliberately one time.
My mom always used to be happy when she dreamed about her dead friends and relatives because she thought they were visiting her to catch up. She would tell them about the things happening in her life and they'd be happy to hear from her.
I'm far less spiritual than my mom, but now that she is gone, when I dream about her I do the same thing because it reminds me of her being happy to tell me who visited her last night.
I've always been stoked whenever I see my dead lol. They age appropriately usually if they died young. It's always a big hug and horns with I missed you! What's good? We share, then it's usually well I hope to see you again sometime! This was nice!
Then off I go to have more cool dreams because playing RPGs since I was a kid has all of mine be pretty fantastic vs boring/daily life stuff.