In Relation To

1. Idiom used to compare to the size, shape, or position of (some other part of the same thing)
Ex) The
Merriam-Webster
CEO of Company
2. Idiom used to talk about what something is like by seeing how it is related to something else or used to talk about something that is connected with or compared with the thing you are talking about
Ex)
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Longman
Food Sales
3. about/concerning (something or someone) or in reference to or in regard to or in relation to or with reference to or regarding or with respect to or as regards
Ex) I am writing in reference to your recent letter.
Ex) I am writing in regard to your recent letter.
Ex) I am writing in relation to your recent letter.
Ex) Do you know what this is in reference to?
Ex) This is in reference to your future.
Ex) With reference to our agents, we have complete confidence in their honesty.
Ex) The search engine just took a few words from the actual search and assumed that we were looking for sites with references to any of them.
Merriam-Webster
Longman
Brand Specialist

In Relation With

do NOT use this expression