well there are a couple of things this could mean, it could be a precognitive dream, meaning you and your mum may have a large fight in the future, so maybe you should listen in on what your fighting about in your dream to prevent this.
Could just a symbol of honesty and maybe you and your mum need to have a heart to heart chat about something your not being completely truthful with her.
Maybe its nothing, and a quick five minute meditation be4 bed with a sprig of lavender near to keep nightmares at bay, if you consider this as a night mare.
Honestly i think if its a recurring dream, it obviously has a message your not getting, make sure you write your dream down and try to remember what you are fighting about in your dream.
goodluck and thank you for reading
When I have those dreams my mother is the aggressor. She picks a fight over something small and ridiculous and I just lose my temper. Say thing I'd never say to her in real life, scream and hit her letting all my anger out.
She's kinda like that. When we had fights they were about nothing but just her picking a reason to be angry at me and the whole world because she overworks herself.