Some of my family members don't speak to other ones. How can I navigate this if I'm on good terms with both parties?

The first thing I would say is to never spy on the other member for someone. If a family member has cut off contact with another, it is likely for a reason and they don't want their trust to be broken. Just don't bring them up in conversation. Try not to talk about the other person when you're with them. It's difficult, and a bit of a headache, but try to understand they have their own reasons. Planning family events can be especially hard, but inviting them both and informing the other that you have done so is the best thing you can do, it then becomes their initiative to either come and ignore one-another, or avoid attending.

When there is tension in a group of people, it can be difficult to navigation those relationships. The first thing to understand is that you cannot control the people whom the tension is between; you must respect their feelings just as much as you would want them to respect yours, this means not trying to intefere with their decision. If you think it will hurt one party to know you are speaking with another party, it's okay to have a conversation with each person separately, to say something like, "I understand you and ___ are not on speaking terms, and that's okay. I still want to have a relationship with them, and I want to have a great relationship with you too. I might still talk to them and do things with them from time to time, but I am still here for you too."

The more we keep quite on the issues, the more worse it gets.so it is always better to find why there is no talking terms between 2 parties and help to fix their issues.

Since you're on good terms, I think the best thing to do is not pick sides. Spend a good amount of time with everyone. If they have problems to work out, they should take the initiative to do that themselves. Some people just aren't the best at working out problems. At the end of the day, we all need family. Best of luck. :)

Try to avoid talking about the other party when talking to the other. If you are trying to fix this, don't. Unless it is affecting your every day life or you are the reason for this, do not try to fix this. It is not your problem to solve. But if that is not your intention, try to stay neutral otherwise. Don't take sides.

You should make your parents understand about the good qualities of those people, and also convince the other party to be good to your parents.

I tend to remind both parties of the good times they had together and how I missed it. I will also respect their space to grow and accept each other again.

It is important to remain respectful to all parties and the boundaries that they have set for their relationships with each other. Make sure that you do not become the "go-between" for the different family members, but also do not short-change your relationship with any of them because of their restrictions on their relationship with others.

Maybe you can try to figure out the reason they don't speak and based upon those answers see if both parties are willing to have a meeting or conversation to work out their issues.

It is always difficult when you feel as though you are stuck in between two parties that you care for. I always find it best to remind both parties that life is short, and family should be loved as much as possible.