Season 8: Episode 13 - "Band or DJ?"

"Band or DJ?": After Robin learns Barney didn’t ask for her father’s permission to marry her, he reaches out to Robin Sr. who refuses to give his blessing until Barney proves himself to him. When Robin discovers her father remarried without informing her, she rescinds his invite to the wedding. Barney convinces Robin Sr. to make amends with Robin and she is overjoyed to receive her first apology from her father. Meanwhile, Lily shares her woes about being a mother to Ted in order to get him to admit to the subtext behind his insistence on a DJ instead of a band for Robin and Barney’s wedding. She convinces Ted to put his feelings for Robin aside and a flashforward shows Ted helping the couple find a band for their wedding.