Walking that Fine Line

New neighbors just moved into an apartment next to our house about two weeks ago. A young couple with a four year old girl. It turns out that they started going to Aaron's parent's church which is really random considering it is thirty minutes away. Labor Day, Aaron's parent's had a pool party with those who had helped with a church clean up day and invited the new neighbors over. This was fine and everything went well, except the husband now has asked Aaron for a ride into town to get to work 2 days in a row now. He works about 15 minutes away. This was fine yesterday. Aaron has to go into town for one of his Marine poolee events and just left an hour early. This morning, Aaron was called as soon as we got home from our church (10am) and asked for a ride at 10:40am. If he had called last night, this would not have been a big deal. We could have dropped him off on our way out at 8am. It was frustrating because of the ill-timing (It's our only time to have the house to ourselves during the week) and having no explanation of why he needs the rides. If it's car trouble or someone is sick, no problem. We're just wondering how long this will continue. Especially after being asked to rescue them by putting some gas in their car since they ran out. We want to be "Christ-like" and help those in need. Unfortunately, there is that very fine line from helping others out to being used by others. I'm not sure if it is ever easy to figure out.