Have an open conversation with them and listen to what they have to say. Let them know your concern. Allow your daughter or son to freely disclose their feelings and thoughts. Arrive at a compromise. Leave the door open for further communication. Assure them that they will have a voice and a choice in deciding when and whom they wish to marry.
You would only be forcing your daughter or son if you do not ask for and acquire their consent. Do not tell them they have to be married. Ask them if they wish to marry. If they say no, respect their choice and revisit the issue again at another time. Never threaten them. Never make them feel guilty. Always approach your daughter or son with love, affection and respect. If you wish to give their photograph to a matchmaker or the potential family of a bride or groom, let your daughter or son know of your intention and ask them if they are comfortable with the situation. If they are not, then do not betray their trust.