Is it disrespectful to call your dad by his first name? My two daughters call me "Wally" instead of dad. Do you think I should say something?

"I'm hungry, Wally", "Mom says I don't have to listen to you, Wally", "you're not my real dad, Wally", "get the fuck away from me, Wally or I'll gut you like a pig"! They're only five and six years old! Do any of you have or had kids that would call you by your first name? Should I demand that they start?

Is it disrespectful to call your dad by his first name? My two daughters call me "Wally" instead of dad. Do you think I should say something?
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