Trach pt./J tube/Heartrate ?

I am a GN who just took the NCLEX today. I currently have a job that is in homecare. The pt. is in a persistent vegetative state due to an overdose of dilaudid (negligence on hospital's part). He has a trach and is fed by a Jtube. My question is whenever I tube feed him his heart rate goes way up to around 100. He gets 296ml at 200 ml/hr three times a day. This patient lives with his parents and is 37 YO. The father is constantly coming in the room and telling me to shut off the TF when his HR is over 88. I think this is not necessary but he demands I shut it off for 5 minutes. Any ideas you can give me to try to keep his HR down?