Listing family members in profile

other than just using text fields, is there any way for users to list family members and their birthdates under their profile? We are a sports organization, families register for the site and then can sign up for specific teams. If we could, I would love for them to be able to list out all their kids and ages so we could easily search the database for kids eligible for specific activities

if you want them searchable, then fields are needed.