Our neighbour has recently moved their football goal so it's now right next to our shared fence (only a short fence) this has meant they are constantly kicking their footballs over into our garden. This is a mild annoyance especially as I'm a little weary about it happening when DD (2yo) is it playing in case it were to hit her but whatever kids are gonna be kids and I can't tell them where to put their goal. Obviously whenever we notice a ball in our garden we toss it back over however yesterday I noticed a ball up at the top of the garden which I didn't go and throw back over as it was pissing it down and quite late on, this morning I noticed the same ball was now in a completely different place... Now I gave them the benefit of the doubt that perhaps it had been blown by the wind or something but had my suspicions so left the ball (again it was pissing it down all day and the kids would've been in school at this point anyway) and forgot about it, this evening I looked out and noticed not only had their ball gone but so has my toddlers. It's now very clear they have entered our garden to retrieve the ball multiple times and I'm pretty upset about it especially since they've never come and just asked for the ball back (I'm on mat leave and have been in the house the whole time) and they've now also taken our ball too.
This neighbour has recently moved in his girlfriend and her two kids (teen boys probably around 13 and 16ish) and has one child of his own who's not there full time (primary school aged) the younger boy has been round and asked us to throw ball back previously and I don't believe he is there currently so believe it to be one of the oldest boys who should definitely know better.
I'm I being unreasonable to be annoyed about this, it's not like we had had the ball hostage for days or anything like that! Planning to have DP go round to have a word after work tomorrow evening (as I'm heavily pregnant and would probably end up crying or something lol thanks hormones!) but wondering if I am being unreasonable to make a big deal of them coming into our garden or if we should just ask for our ball back and keep the peace (we don't really speak with this neighbour usually)?