Is this your grandparents' composite?There is a strong Uranian theme, with four planets in Aquarius and Uranus (ruler of the 5th house) in the 7th house -- definitely an unconventional relationship. Either they give each other a lot of space, or life's circumstances keep them apart. The emphasis on the 5th house indicates fun and romance, they have a good time together, but may lack the commitment involved in maintaining a day-to-day partnership or union -- that's 7th-house territory. They may love each other more when they are far away from each other, but when they spend a lot of time together can face some nasty disputes and bickering (Mercury and Saturn square Mars in fixed signs). Ego clashes could be a problem if either person tries to restrict or limit the other.
Saturn in Aquarius in the 4th could have prevented them from establishing a home together... or given them difficulty emotionally relating.
With Pluto in the 10th square Uranus, career could be a factor in keeping them apart. Perhaps one partner has a very powerful job or role in society... or alternatively, as a couple, their "focus" could be on transforming themselves or the things/people around them. With the MC ruler being the moon, in the 12th house, in Virgo... something involving health, healing, mental disorders, or spiritual service -- some kind of Virgo/Neptune combo -- could characterize the career of one or more partners, or could relate to the public image they established. Or on a lower level, it could indicate alcoholism or cheating by one of the partners.
Even when they are separated though, that lovely Jupiter/sun conjunction in the 5th house indicates a basic friendship between them; it is hard for them to stay mad at each other for long and they naturally lift each other's spirits.
And Libra ASC may project a very social, pleasant image to the world, perhaps masking any tough issues they faced as a couple -- they still appear friendly and graceful together.