Teach your child to address people they meet by their title and name as they arrive to a party and greet an adult. Also make sure they include eye contact as they say hello. This can only be mastered through real-life practice, so try out greeting your kids as if you weren’t their parent, and over time they will master the skill.
As you practice greetings with your kids, eventually include a firm handshake, preferably with the right hand, reminding them that most people are right-handed, in case they are a lefty. Make sure the grip is not too hard or too soft, but right in between.
First things first — in order to teach your kids these two essential phrases, you must use them yourself. Don’t become impatient if you have to remind your kids 1,000 times — the repetition will pay off and have an impact later on. In passing, talk to your child about why saying these phrases is important, and they will eventually want to use them if they understand the meaning.
Since this phrase will especially come in handy in family and public discussions when your child wants attention, it is essential when teaching your kids party manners. When at a party or just at home, try not giving your child your full attention until they say "excuse me," making it clear that other people may be tending to something important and can’t drop everything to pay attention to your kid. This will ensure that when your child is at a birthday party, they won’t be the one yelling out of turn trying to seek attention when they want to speak.
This pairs well with the last tip, making sure that your child knows that adults may be discussing something important while they want attention. Have a pre-determined signal, such as a thumbs up or down, to acknowledge that you will listen in a moment when you’re finished talking. Also, although this one is difficult to model, try reversing roles and saying "excuse me" to your kids so they can see their role model practicing what they preach.