help (someone) in
1. To aid someone in entering some thing or place. Help Grandma in, will you? She sometimes struggles with those steep steps.
2. To aid someone in some pursuit or action (named after "in"). Can you help me in finishing this application? I'm not sure what to write here. I'm sure someone helped him in his attempt to burglarize our house.
help someone in (to something)
to help someone get into something. I will help my grandfather into the car. We all had to help him in.
help someone in something
to help someone with some task; to help someone in the doing of something. Please help me in my efforts to win the contest. Will you help me in my reelection?