Summarize this article in one sentence.
A younger child may not understand what a boyfriend/girlfriend relationship is.  They may just see your boyfriend as someone to have fun and play with.  An older child (likely above 11 or 12) might be more aware of the relationship that you and your boyfriend have.   If your children are older than 12, consider ways to talk with them about your boyfriend.  You may want to discuss with your children about your boyfriend before they meet in person. If your children are really little, like four years old or less, they may not have much interaction with your boyfriend other than to play, and that's okay. Don't make it awkward by trying too hard.  If you share too much too soon, it may make your child, and your boyfriend, confused about what's really going on.   For your younger kids,  you may want to introduce him as "your friend."  Younger kids have a limited understanding of your relationship on a romantic level.  Keep it simple when giving an introduction. For your teenage kids, you may want to be direct and introduce your boyfriend and your teen by first names.  Keep the conversation light.  If your older kids have questions, allow them to share their feelings after the meeting with your boyfriend is over. You don't need to explicitly state that your boyfriend is "your boyfriend" or "your special friend." When your boyfriend meets your kids, allow your kids to be as they are normally when they meet with your friends or relatives.  Don't make them act in a strange or new manner that they may not be used to doing.  Do not make your children hug your boyfriend hello or goodbye. A handshake is appropriate, but you want your child to be secure about their personal space. Let the child decide when they are ready to display affection. Giving a false impression of who you and your children are may make it more difficult for your boyfriend to trust you and see how you truly are. Allow interactions between you, your kids, and your boyfriend to flow naturally. Provide your children reassurance if they appear concerned when meeting your boyfriend.

Summary:
Be mindful of your child's age when making introductions. Introduce your boyfriend in a straightforward manner. Allow your children to act like themselves.