This Golden Rule seems to be forgotten when families get together. Remind your children, and yourself, to treat others as they'd like to be treated. You probably don't like others to meddle in your life, so don't meddle in theirs. You wouldn't like for your brother to tell you how to raise your children, so don't tell him how to raise his. Communication, or the lack thereof, is the root of many problems between family members.
Many families have difficulty expressing their true feelings to each other.
When the truth is spoken aloud without tact or forethought, feelings get hurt or tempers ignited. Nevertheless, keeping emotions bottled up can do just as much harm. Tell your children, and remind yourself, to state what they mean clearly and compassionately, and to never say things just to get a reaction or to hurt someone's feelings. Everyone has their own lifestyle, and each member of the family should feel free to pursue that life regardless of how frivolous, misguided or off the beaten track someone else may think it is. Holiday get-togethers, especially when alcohol is involved, are usually not the best time to solve the perceived lifestyle problems in your family.