My do his parents stare at me?

Well, I went to a restaurant with my mom and the guy I thought who was cute was there. His dad is from my town and his mom is from a half hour away. He comes home every other weekend. Every time I see his family members, (Dad, Step-mom, Sisters, and Grandparents) wherever i see any of them, they always stare at me. And, when his 3 step sisters see me, they start yelling out my name, waving, and get all excited. (They are elementary ages). They just stare at me for like 7-12 seconds whenever I see them! During the summer, I volunteered at a daycare that they went to but I didn't know the girls then..except the youngest one which is 3. Why is that? Would that mean this cute guy likes me? I've never IM him or anything. I maybe saw him 2 times at the age of 15. But when i saw him at that restaurant, my mom and his dad had a short convo for like 30 seconds and us 2 never talked or anything..This has been happening for 7 months already. His family just starts REALLY staring at me when i see them downtown or anywhere. Why would he like me if I only see him once in awhile? I have never IMed him or anything. We both go to a different school because he lives with his mom.