When Lily's estranged father shows up unannounced on Thanksgiving, we learn what led her to stop speaking to him three years ago.5x9 509 S05 E09 se05 ep09 05 59
Watch How I Met Your Mother Season 5 Episode 7 -Lily comes up with a perfect plan to break up the relationship between Barney and Robin when they have a rough patch, but she needs help from Robin's famous friend, Alan Thicke, in order to make it work.Watch How I Met Your Mother S5 E7 S05 E07 Se5 Ep7 507 5x7 5.07
Even though they do their best in order to be the perfect couple, Barney's attitude of know-it-all lands him in trouble with Robin and they are forced to seek Marshall and Lily for advice.