Welcome to planDisney, Lidia! We are glad you brought your question to us.
As you know, at this time all Guests ages 3 and up must have a
Disney Park Pass theme park reservation in addition to valid
admission in order to enter a theme park. If reservations are available on the date you plan to visit, your additional family members can go ahead and purchase tickets and make their reservations. Disney Park Pass reservations are not like dining reservations where the entire party must be on the same reservation in order to be seated together. As long as everyone in your party has a valid ticket and a Disney Park Pass reservation, you may all enter the park together.
Things get a bit trickier if Disney Park Pass reservations are no longer available on the date you plan to visit. I have been keeping an eye on the
Theme Park Reservation Availability Calendar, and I know some dates have limited availability. You can continue to check for reservation availability; other Guests' plans change all the time and it is possible that reservations might become available for your selected park. My recommendation would be for your additional family members to purchase tickets with the
Park Hopper Option. This way, they could make reservations for whichever theme park currently has Disney Park Pass availability, and then after enjoying that park, "hop" over to join you at the theme park you'll be visiting after 2:00 pm when park hopping hours begin.
Lidia, my assumption was that your question was asking about Disney Park Pass reservations. If instead, you were asking about hotel, dining, or another type of reservation, please feel free to write us back and we'll be happy to help.
Anne Marie