Even as a small kid back in the 50's I called all my parents friends by their 1st names and that's just exactly how they wanted it. When my kids came along it was the same, they called my friends by name and their friends called me Lew
As a kid my aunts & uncles were 1st names and my cousins called my parents by their names.
Only people in all our families that has titles were Grandparents
All of my wife's family was the same and still is.
And in case anyone is wondering, EVERYBODY turned out great.