Are they being controlling or is it because they really want to go with me?

So on Saturday i told my girlfriend and boyfriend that i am going to mexico next year and as soon as i said i was going they invited themselves and were like when are we going. So i said next year around July or September but im going to be out with my family cousins, uncles etc and they both are controlling even they say they are not it would be their first time going so they want to get to know mexico city too but im not sure if it's controlling or because they want to know what mexico city is like
Are they being controlling or is it because they really want to go with me?
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