Zero is still a pup, and as he gets older, "approx. 15 months"
you will see that his temperament will change possibly even more.
When Zero hits adolescence he might not be as friendly to strangers/or strange dogs as he is now.
Your mom has a full plate, taking care of your father and
working full time. You picked an interesting breed for your
first dog.
You might want to consider finding a good trainer who uses positive methods/
is knowledgeable with working breeds to come to your house to work with zero and your family.
Once you and your mom have the tools you can continue the
training on your own. (training is on-going with Akita's, you give
an inch they take a mile.)

(Not all dogs can be trusted around young children.)
Good luck, I can tell from your posts you love Zero very much
and want the best for him.