There are many approaches to teaching grammar, but I have found a couple I really like. They are easy for parents to implement.
1) http://www.rfwp.com/
4 level analyses are simple & I think easy to learn. This is similar to the other one, but uses jingles for memory work.
Both of these sell to “homeschoolers”- so you can buy them & work with your child in the summer, weekends, etc. This is something they really need to master!
The Grammar Blue Bookhttp://www.grammarbook.com/
Grammar Bytes- great siteJ
http://www.chompchomp.com/menu.htm