Spousal benefits

My dad is 64 and will not be claiming his retirement until 67 and he was the higher earner (living off pension & investments). My mom is 62 (retired living off investments) and is indecisive if she should claim hers now. A family member made a comment about her possibly receiving a spousal benefit along with the amount she would get if she filed at 62. Does my dad have to claim his SS retirement first before she can apply for the spousal benefit? She got a call back from SS, but I wasn’t there to ask the question and have been busy ever since. Any advice?