How do i capture a friendly mom and kitten and 3 other skittish kittens?

My mom and her friend and i recently came across a litter of kittens and their mom at a university. The mom and one of the kittens we can hold and pet and we can easily get them in the crate, but the problem is the three others! We really dont want to seperate them and hoping to take them all soon. The population of hawks is scary and were afraid something might happen to them. First we get food and try for them to come into a enclosed area but we cant seem to get them. We are going today again and hoping to catch them... any ideas or tips? Anything will help!! :) Thanks~!