Wooba, it's such a difficult situation but I'm inclined to agree with May - let him live the life he thinks he wants right now. I dont think you have to initiate a R talk, but rather go at it bit by bit - explain that because of the current situation you are not comfortable in playing happy families and taking the trip to his parents.
A trip on his own, with the kids, to see his parents, without you sounds like the perfect opportunity for him to have a reality check about what life means without you in it. If anything you are being kind to him, giving him what he thinks he ultimately wants - that isnt antagonistic, hostile or unfriendly. You are so accomodating in letting him come and go as he pleases and he really needs to begin to understand that things wont continue on his terms for evermore. You wont always be at his side - I'm not sure if he realises that.
Hugs Wooba
M:49 H:49 T:20 M:18 D:16 D:14
EA: Feb 2019-May 2020 Separated: Mar-early Aug 2020 H asked to reconcile: Jun 2020 EA relapse: Oct/Nov 2020 Recon #2: since Nov 2020