No, your parents cannot use your frequent flyer number to earn miles or status for their own travel. Frequent flyer accounts are strictly tied to the individual traveler whose name is on the ticket; you cannot "double-dip" by putting your number on someone else's boarding pass. However, in 2026, many airlines (like Emirates, Air India, and British Airways) offer "Family Pooling" or "Family Accounts" that allow up to 7 or 8 family members to link their individual accounts together. In this setup, while everyone still has their own number, the points earned from everyone's flights are funneled into a central "pot" that anyone in the family can use to book award travel. If your airline doesn't offer pooling, you can still use your miles to book a ticket for your parents, but they will not earn new miles on that flight because the passenger name doesn't match the account holder.