Romans 12:18 -- If it be possible, as much as lieth in you, live peaceably with all men. 

God's word tells us that second only to loving God, we are to love each other. So, it stands to reason that first loving God and then loving each other is what is at the foundation of living peaceably with family, and not just emotionally, but in our actions. The commandment to love is a verb, an action. 

"And whatsoever ye do, do it heartily, as to the Lord, and not unto men; Knowing that of the Lord ye shall receive the reward of the inheritance: for ye serve the Lord Christ." -- Colossians 3:23-24

God's word tells us to do all things unto Him and to seek to please Him, not man, not even family. And His word says that we are to take all our cares to God and to pray without ceasing.

“Pray without ceasing,” Paul said; “Pray without ceasing. In every thing give thanks: for this is the will of God in Christ Jesus concerning you. Quench not the Spirit," (1 Thes. 5:17–19.)

If family members were living this way, walking this way, would there ever be any family estrangements? Could you imagine how it would be if we all took everything to God in prayer?

Imagine if we told God how we are treating a family member. I've done this. I had a situation a few weeks back, where I went overboard with my mouth, when upset with my husband. The next day, I was talking to God about it. It went something like this, "Lord, I think I may have... I went too far and need to say sorry to Tim." I could not even get the words out, words that made me not sound so wrong. The conviction got me, mid-sentence. Mid-sentence my words changed.

If you want to do your part in keeping things right or making things right with a family member, then talk to God. Talk to Him about what you have done and or are planning to do. If you need changing, He will change you. Now, you can only suggest the other person do the same. And if that person is not willing to, there is nothing you can do about that.

We do need to realize that the scripture says, if it be possible. It will not always be possible, like if the other person does not want to be at peace. But then for our own peace, we should do what we need to do to let go of the situation and turn it all over to God and then go on with life.