If we can't meet up in the mountains, let's...,

[Silverobama]

Thomas and I are supposed to meet each other in the mountains but he and his family still hasn't decided when to go there while I am very likely to go there next week. So, in case we can't see each other in the mountains, I provided plan B for him:

If we can't meet up in the mountains, let's do it in Chongqing*.

Is my italic sentence natural?

*The mountain where we will be meeting up is 2.5 hour car ride from Chongqing.

 

[emsr2d2]

Thomas and I are supposed to meet each other in the mountains but he and his family still hasn't haven't ("he and his family" = plural) decided when to go there, while I am very likely to go there next week.

Note my corrections above.

So, In case we can't see each other in the mountains, I provided a plan B for him:

Yet again, you've started a sentence with "So"! In my comments on your last thread, I reminded you that we've said before that you shouldn't do this. Use it as a conjunction. Please take notice of our advice.

If we can't meet up in the mountains, let's do it in Chongqing*.

Is my italic sentence natural?

*The mountain where we will be meeting up is a 2.5-hour car ride from Chongqing.

Yes, that sentence is fine. The distance between the mountains and Chongqing is irrelevant.