I need this to be integrated with the filters they already have. For example, when my dad forwards me every joke that's ever been forwarded to him over the las

I need this to be integrated with the filters they already have. For example, when my dad forwards me every joke that's ever been forwarded to him over the last 24 hours, I don't want them cluttering up my important emails. However, if he actually writes something (rare, but occasionally happens), than that's important. Integrating this with the filters would allow me to use the FWD: and FW: subject line tags to segregate his important vs his non-important emails.