I'm sorry if this is a duplicate question (or a trivial one) - I don't know what to search for (my searches for the question title only bring back mathematical answers).
I'm planning on dropping off my daughter with my grandparents for the summer break and returning at the end of summer to pick her up.
The problem is, I'm not familiar with the ordering process - I bought simple 2-way tickets in the past but in this case she needs one return ticket for the whole summer and I need 2 separate return tickets, one at the beginning of summer (for the drop-off) and another at the end of the summer (to pick her up). Obviously, the leaving / returning dates must coincide on the tickets and I'd want her to sit next to me on the flights. The trips are between Dallas-Fort Worth (DFW) and Budapest (BUD).
What is the easiest way to get such an arrangement? I don't think this is supported on sites like Travelocity and the like.