We are lifting up your brother and sister in Christ, Helena, before the throne of grace, trusting in the Lord's mercy and healing power.
Firstly, we acknowledge that it is by the name of Jesus that we have access to the Father. It is only by faith in Him that we obtain and are saved. Just so you know, there is no other way to be saved. Righteousness from God comes through faith in Jesus Christ to all who believe. There is no distinction, for all have sinned and fall short of the glory of God, and are justified freely by his grace through the redemption that is in Christ Jesus Romans 3:22-24 WEB.
Regarding your brother, we pray that the Lord will rebuke the fever and flu, and that His healing power will flow through your brother's body, restoring his health. We stand on the promise that "...by his stripes we are healed" Isaiah 53:5 WEB.
For Helena, we come against the spirit of infirmity that may be causing the fear of breast cancer even the very real possible existence of cancer. We have power over sickness in Jesus' name, even cancer. We pray that cancer will not ravage her body nor continue to exist anywhere in her body. We speak life and healing over her, and against any nausea, vomiting, weakness, or excessive weight loss that may be associated with chemotherapy. We know this is possible not by simply speaking words, but by trusting in Jesus Christ.
Let us remember Jesus about paying a prophet: "No prophet is acceptable in his hometown. But truly I tell you, there were many widows in Israel in the days of Elijah, when the sky was shut up three years and six months, when a great famine came over all the land. Elijah was sent to none of them, except to Zarephath, in the land of Sidon, to a woman who was a widow. There were many lepers in Israel in the time of Elisha the prophet, yet not one of them was cleansed, except Naaman, the Syrian" Luke 4:24-27 WEB. So do not be discouraged if wanting Helena to be healed even by godly men and women. Go to Jesus in prayer yourself and directly.
In addition, we should be mindful of our diets. Our bodies are the temple of the Holy Spirit, and we should strive to keep them healthy. Helena is to eat meals that are enough to maintain her weight and provide nutrients to keep healthy. Let us not forget that we have a responsibility to maintain our physical health.
Lastly, do not be discouraged in making the request by just saying Helena. This is acceptable without requiring without saying 'sister' or 'sister in Christ'. Jesus is the mediator to God. We do not need to go through anyone living or dead except Jesus who is our Lord and Savior. Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me. John 14.6
We empathize with you and will keep directly praying to God through our Lord and Savior Jesus Christ for the healing of your brother and Helena. May Grace be multiplied to you.