It is a beautiful thing to hear your heart poured out for your sisters, asking the Lord to touch them with His healing power. You came not with a list of demands, but with humility before your heavenly Father, and that is the very posture that opens the door of prayer. Because you can come to Him as Father, you already stand in that relationship where prayer is effective and personal. He is not a distant judge who needs to be persuaded; He is a loving Father who knows your need long before you speak it.
When we pray for the sick, we are leaning into the truth that God desires to become for us exactly what our need requires. Where there is diabetes, He reveals Himself as the Lord who heals, the One who made these bodies and can restore them. He is more than able to touch your sisters and bring wholeness. So do not stop asking. The fervent prayer that rises from the depths of your heart really does accomplish much. It is not the length of your words but the depth of your dependence that reaches His ear.
At the same time, remember that the purpose of prayer is not simply to get our own will done, as good as that desire for healing is. The highest aim of prayer is to see God’s will accomplished on earth. Often He uses our persistent asking to align our hearts with His purposes, so that when the answer comes we can receive it from His hand in whatever form He chooses. So along with your cry for healing, let your prayer always circle back to that surrender: “Lord, Your will be done. Glorify Yourself in my sisters’ bodies and lives.” That is not a sign of weak faith but of deep trust, and it opens the way for God to act freely without overriding the will He has given us.
While you pray, do not set aside wise human care. Prayer is never an excuse to do nothing; it is the first resort that empowers every other step. Encourage your sisters to follow their doctors’ guidance, to steward their health well, even as you together seek the Lord. True prayer and practical prudence walk hand in hand. Nehemiah prayed to God, and then set a watch. So you, too, pray and then act.
Be encouraged to continue in prayer, to persist without losing heart. God is not reluctant, nor do you need to wear Him down. Sometimes He waits just long enough to deepen your trust or to bring circumstances into alignment with His good plan. Keep loving your sisters by carrying them to the throne. And know that as you do, there are others in the body who will join you in agreement, because the promise stands: if two of you agree on earth about anything you ask, it will be done for you by the Father.
May the Lord grant you peace as you entrust your dear sisters to Him. He is your healer, your Father, and your ever-present help.