The mother.
People with Aries on the 4th house cusp tend to have activity in their homes. The parents may have been aggressive in the early life or there was much fighting, particularly if Mars is afflicted. There may be a tendency to live in areas where there is fighting, loud, rude people or crime. These people may enjoy do-it-yourself projects and actively seek to improve their homes. This position is akin to Mars in the 4th house/ Cancer.
Aries on the fourth house denotes an aggressive attitude toward the home and family. You always take an active interest in the affairs of the home. Too often though, quarrels and spats result if your ideas of how things should be handled aren’t accepted. There is a tendency to force issues and demand too much. Much of your success in life may be attributed to an ambitious mother who inspired you to make the best of yourself. The fourth house denotes activities in the latter part of life. With Mars ruling this sector of the chart, the later years will be very active. A more daring and outgoing, even youthful personality emerges as you grow older. Mature and serious in your youth, you are apt to grow child-like, and more assertive and physically active in the latter part of life.
The native rebels in some way against his/her background and parental authority and general conditions in the home. This person will radically change his/her methods many times. There is a tendency to throw over a good plan in favor of a new approach before the old one has time to prove itself. The native needs a good home situation but will be constantly changing it. There is apt to be considerable uncertainty and self-doubt as to the soundness of his/her own approach, and at the same time the native is against allowing anyone else to decide such matters for her.
Summin in the stars.. 