the big ones,,,you have 2 are for binding...hemming...do you have the manual because it will have the parts listed...you can google it and they will come up..the 2 with the little hole in the centre are gathering feet for ruffles...then I see 2 with a little curled part to it...that is for making a small rolled hem..tricky to feed the fabric as you begin..that is why I said if you find a tutorial or a demo.it would help...the 2 with the s shape are also for binding...but you have to know how to insert the fabric...looks like your MIL had doubles..the one in th second row with the little measurements is for hemming too...do you have the manual...