Uranus in 4th house is house of feelings, to feel home and welcomed and is the impression and personal window to experience own mother - not the whole picture and not the whole reality mother really is.
Interestingly, traditional astrology assigns the fourth house to the father and the tenth house to the mother. Modern astrologers sometimes reverse that, sometimes keep it the same, and sometimes just consider the fourth/tenth house axis to be the parental axis, with either house describing either parent.
The moon is also considered to represent the mother--not who she is to herself, but who she is to you. Your moon would, in some way, reflect your own mother. Your son's moon reflects you--not necessarily as you are to yourself, but as you are to him.
That lovely Sagittarius/Jupiter moon makes me think you're the kind of mother who will encourage learning and encourage going out and having experiences. Perhaps you'll expose him to different cultures. (I have a Sagittarius moon myself, and that is indeed what my mother did.) My moon is also in the twelfth, and when I was born, my mother had been confined to bed for some time because of pregnancy complications. She was mostly healthy when not pregnant, but she went through three pregnancies (I was the first) and all of them were rough.
Uranus in the fourth, I would see as possibly moving a lot, or maybe home life is chaotic in some way, or maybe there's something unusual about the family. Fourth house also describes the homeland, home country. I saw on another post that you said you're in Venezuela. Uranus, in this context, could describe the upheaval in the whole country, which he was born into.
And, your son was born during a Uranus/Pluto square, as are all children currently being born--it's something his whole generation has. What's going on in the world, globally, reflects what the outer planets are doing. People with the outer planets touching their personal planets are especially in tune with the zeitgeist of their generation. Your son has this, with his Venus conjunct Pluto. Whatever world affairs his generation has to deal with, he's in the thick of it. Kind of like Forrest Gump turning up in every landmark scene from the American Baby Boom generation.
Regarding your son's Mars, I did a reading recently for a friend who has the same Mars house placement--fourth house but not near the cusp. Someone mentioned up thread that it could indicate brothers--indeed, my friend's only sibling is a brother. If Mars were tightly conjunct the IC, I would be more inclined to believe there was violence in the home. Not necessarily physical violence, but maybe a lot of arguments, and yes, maybe abuse. Or maybe just a lot of competitiveness. In my friend's case, abuse wasn't part of the picture, but she described her parents' relationship with each other as dysfunctional in ways that she didn't realize until she was an adult. Her parents got along well, though, and they've stayed together--it wasn't a tear the family apart kind of dysfunction.
With Mars in the fourth but not so close to the IC, abuse doesn't come to mind immediately. What Mars does represent is how and why we would fight, and a fourth house Mars would indicate that the family of origin fights the same way, so it's pretty deeply internalized. Taurus, as a sign archetype, is the "strong, silent type," not easily prone to getting worked up, won't fight for no good reason, but will defend their space at all costs. So, I'm getting the picture that the family he grows up in, your family, is likely to be one where issues aren't talked about much if at all, people give each other the silent treatment when angry, and people tend to need their personal space. Does that sound right to you?
, and YES i have the moon in the 8 house of my nathal chart and has a square with neptune(11 house) and uranus (12 house) and a trigon to my ascendent aquarious , also a sextil to mars in the 7 house