in relation to (something)
Regarding or related to something. In relation to your vacation request, I'm sorry, but we can't grant it while we have three people out on leave. I think that we should write up another report, in relation to this one, so that we have a full picture of the budget for next year.
in relation to someone or something
relating to someone or something; in connection with someone or something. I mention this fact in relation to your proposed trip. Let's discuss Bill in relation to his future with this company.
in relation to
In reference to; in connection with: This letter from the bank is in relation to your mortgage.