What do you think about this? ( plzz answer) :)?

My boyfriend is going to be getting his 3 kids for the whole month of july & im nervous because they have never actually stayed with him like that ( its a long story) . They are Girl,14.boy,12.Girl,8. Ive met them & hung out with them & they are good kids & are good with my boyfriend but they still wish that their mom & my bf were still together & im worried that won't like being here because of me. Is there anything i can do to make it not so weird ?