Concerning laws within one's private life let's get real about morality and safety laws affecting private lives:
Should a private citizen be able to build his house and move his family if it would collapse under 30 mile an hour winds or should he be required to follow government building code regulations established by an engineer that rightly understands the risk?
Irrelevant. We're talking about what a person does with their own body.
My nephew-in-law expressed his intent to tattoo his young children after purchasing equipment, while his family struggled keeping food on their plates I might add and after displaying and bragging about his “artwork” that looked like a typical 8 year old’s cartoon drawings and after my objection was ignored I “very strongly” warned him not to do so. I suppose this private citizen should be allowed to do whatever he wanted with own children and on that note I should be able to do whatever I wanted in my personal life to stop my nephew’s plan for my great nephew/nieces? Or should there be government regulations/lines to be drawn concerning these matters?
Irrelevant. The issue here is what a person does with their own body.
In the privacy of their own home should parents be allowed to engage in swinging parties in front of their children? How about sacrifice puppies and give the blood to their children to drink? Get drunk and stoned and defecate and throw-up all over the house that their child crawls through while they lay passed out on the floor?
Not analogous. The issue here is what a person does with their own body.
Should a mother (private citizen) that is too preoccupied with getting stoned be able to neglect teaching her otherwise normal 2 ½ year old to walk and talk be allowed/entitled to let her child continue to live under those conditions?
No. But it is also not analogous, as the issue here is what a person does with their own body.
Should loaded guns be allowed to lay all around the house with young children present because the parent (private citizen) claims they are entitled to do so being their children have been taught not to play with them? No line to be drawn on this judgment?
Yes, but that's irrelevant, as your hypothetical is not analogous to the pot smoking issue. .
Should a parent be allowed to give their child alcohol or other drugs according to their own private determinations of its value and safety?
Not analogous. The issue here is what a person does with their own body.