I'm applying for a UK visit visa as a single employed girl in Pakistan. My father is going to be sponsoring my visit. Is it going to be of any benefit if he explains in his Letter of Support that he has previously sponsored a trip for my mother and sister to the UK and that they returned as scheduled? And also that he sponsored a trip to Turkey for the entire family?
Your father should explain why he is sponsoring you (eg because he has previously sponsored other family members and wishes to do the same for you) but having a sponsor does not remove the need for you to qualify for a visa in your own right. See under ‘Sponsorship Issues’ in UK visa refusal on V 4.2 a + c (and sometimes 'e')