A struggling poet returns home to care for his terminally ill sister but conflicts arise again with his overbearing and domineering mother.

What does him being a poet have to do with the story? Maybe his mother cut him out of the family because of his "unconventional" career choice and after ten years calls him to come and see his sister?

What does him being a poet have to do with the story? Maybe his mother cut him out of the family because of his "unconventional" career choice and after ten years calls him to come and see his sister?

What DPG said.

Also it would help you in future to think of characters in terms of motivation and action, good characters MUST achieve something for a reason - they are their pursuit of their goals.

In the context of this post, what was the event that made him have to take care of the sister now? This event, or inciting incident, should be mentioned at the start of the logline.