Hello and welcome to our friendly forum.  Its devastating for you all as I know only too well, my husband died a year ago this week of lung cancer.  You need all the support you can get and I suggest you call the McMillan nurses who can assist you and give you all the care you need, this includes end of life care and the doctors surgery should be involved as well so he receives palliative care at home.  There is also a carers package that can be put in place but you need to be proactive and ask for this as there are not a  lot of places available but it will assist your mother in law.  I know she is saying she can't go on and it's natural, I told my daughters that I couldn't cope and they rallied around and left their families to help me but their Dad only lived three more days.  If he is gasping for breath then he should be on oxygen 24 hours a day.  I'm not medically trained in any way but I do know what can be done. Making memories is not going to happen I'm afraid as he is obviously too ill but spend time with him, chat as normal and still laugh when you can.  Make sure everything is in place with how he wants to control his last few weeks.  His Will, a DNR, discuss all of these because if you don't it will make things even harder when he can no longer tell you what he wants.  My heart goes out to you all and I do hope that this has helped you to be pointed in the right direction.  If you want more help message me privately on my page.  Carol x