Pisacha yoga in combined charts

1
As I was going thru my friend and her BF charts I found that in my friends 5th house - taurus she has Mars and in his taurus he has Ketu.

I am not an experts but this upsets me, because if we combine 2 charts then Mars and Ketu in Taurus which is hers 5th house will create Pisacha yoga, which is a disaster? If they marry and have children then their children will be very cruel and violent? This is serious, please reply. :(
suran

5
It would be nice if there were a jyotish forum on this site, if only so I can finally figure out what any of it really
There are Indian astrology websites, and some forums use both and some people mix and match. I have no problem with Indian astrology, but I don't think it's place is with William Lilly. Actually, I don't know anything about the subject. I'm sure it produces accurate reslts when it is in capable hands, but it definitely is not traditional Western Astrology.

Tom