hubby hit from rear hard at stoplight & pushed into car in front of him.Report hubby's fault. Lots of discrepancies between the 2 reports.What to do?

Lady in front car said she "thinks" she felt 2 impacts, girl behind doesn't know what happened. So cop made 2 reports saying hubby hit car 1st then hit from behind. Considered it 2 seperate accidents. Hubby 100% positive he was hit first & pushed into car. Drawing of vehicles P.O.I different on the 2 reports. Report cop says, He "thinks" girl behind hit hubby because he didn't have his lights on. No where in report do drivers or & any witness say his lights were,not on, Not only were his lights on but his brake lights too. No where in reports does it even mention stop-light. One report says defected lights, one says no lights. One report his truck hit car straight on & one reprot shows he hit at angle,true passenger side bumper & turn signle damaged, that is the way he hit. his seat broke into reclining position on impact, thru him back, feet came off pedals& break. His glasses landed behind seat. The cop made no mention any of that there is more,no space. What can we do.Feel helples