I know I've done it in the past when I didn't know what to say--offered the "at least you have x or y" comfort statement to someone who is grieving.
But think of that so-called comfort. Think of the last time someone offered it to you. Did it help? Probably not. Most likely, it just opened that chasm a bit wider as you suddenly thought "oh, man; am I being selfish grieving about this one thing when I *should* be thankful for these others?"
No. Of course not. There's nothing wrong with your grief. You are *meant* to feel that grief. You need to have someone offer their heart--a heart that's been there--and simply to sit with it.
Do not feel the need to "at least" do or think or feel anything. Feel what you have in your hands right now, in your heart. Let it do its work, because even pain is a step in healing.
Then, the next time you need to lend your heart, there will be no "at least." There will be silence and breathing and the beating of an organ steeped in the experience of what it is to be human.