It’s good to be realistic with your own limitations. Being a caregiver for a loved one is hard, even when the more difficult aspects of it wouldn’t bother you in a less personal setting. It wouldn’t serve you or your family if you had to bear the weight of caregiving when it is immensely psychologically taxing, in addition to the emotional aspect of preparing for loss of a loved one. You’d be surprised what you can handle when you’re in such a situation, I will say, but it shouldn’t be expected of you. Good on you for recognizing that your best support would come in other forms.