Determine why your dog jumps - excitement, attention seeking, lack of training.
Teach your dog to sit politely for attention rather than jumping up.
Say "off" when they jump, then praise and reward when they get back down.
Use a Cue Word
Ignore your dog until all four paws are on the floor before engaging.
Role play greetings with family members and ask guests to help train.
Practice Makes Perfect
Keep them leashed when greeting people so you can easily control behavior.
Keep Dog Leashed
Everyone must reinforce the rules to avoid confusing your dog.