There’s this friend of mine that lost his mom, and I asked him “how have things been for you?” he responded, “I miss her” and I responded to him with “ It's completely understandable to miss her. Grieving takes time, and it's okay to feel how you feel. I'

You can respond with something supportive and reassuring. Here’s a suggestion: "Thank you for asking—I appreciate it. We're doing okay, but my main concern is you right now. If there's anything you need or if you want to talk more about how you're feeling, I'm here for you."