Just FYI we can't see your mother's profile. She appears to be a living non-member of WikiTree (since her profile is Unlisted), so she would not have a DNA test entered here. Is your cousin a WikiTree member with their DNA test entered here? Per the DNA Confirmation help page, "It's also recommended that at least one of the test takers enter their DNA test on WikiTree, and set their profile's privacy level as Private with a Public Family Tree or higher."
If not, do you match your first cousin sufficiently on GEDmatch or another site based on the DNA Confirmation criteria? If so, since your DNA test is entered here, you may be able to do the confirmation through your match with your cousin.
Also, I noticed that in your DNA confirmation statements for your parental relationships, you mention the names of your mother and brother with links to their profiles. Since they both appear to be living non-members of WikiTree (Unlisted profiles), you should probably remove their names/links and just leave their relationship to you in order to protect their privacy.
Also, since you descend directly from your father, I believe that he is the MRCA for your relationship to him. Same for your mother - I believe that she would be the MRCA in your relationship with her.
EDIT: Assuming that at least one of the above aunt/niece or first cousin DNA matches/relationships meet the WikiTree criteria for confirming 3rd cousins or closer, I believe the WikiTree policy for 3rd cousins or closer is to mark all relationships up to the MRCA(s) as "confirmed with DNA" and provide the corresponding confirmation statements on the profiles. So in your case, I believe that you would mark the relationships between your mother and both of her parents as "confirmed with DNA" and add the confirmation statements to your mother's profile.