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I know of some people who are particular not to go to the mikveh together with a close relative (father-son , brothers, and even brother-in-laws).
On the other hand I also have seen Chassidim and Yirei Shomayim who are not particular about this (including a father going in with his young son for Chinuch).
What are the issues involved here? AFAIK this a matter of halacha as I have seen the Remah in Shulchan Aruch (Aven HaEzer Ch 23 Halacha 6) referces this issue.
The gemoro in Pesachim 51A says that father, father-in-law, stepfather and brother-in-law (sister's husband) are forbidden, and that there are those who are machmir on brothers as well.
According to Rashi the issue is that it would lead one to impure thoughts, to see the place from where he or his wife were produced, or thoughts about his brother-in-law and sister or mother and stepfather together. For those who are stringent on brothers, it is not because it would lead to thoughts, but as a gezeira on brother-in-law.
