when you say Advance Parole, I assume that you applied for AP through TPS. Since you Current status is TPS, you can leave the country with AP and re-enter US (POE officer decide your faith whether you are allowed to re-enter or deny). AP does not mean 100 % chances of re-entering the US, its not a VISA. So there is always a risk to travel through AP while on TPS. Going to home country under emergency condition (proof needed) might be strong reason to support why you need to travel but going to CANADA ? Afterall, its your decision and I would suggest to consult Lawyer before taking any decision. Your H4 will not be affect while you remain in TPS and travel through TPS with AP, your previous status still remain as long as H1B (your primary H1B status holder, may be your spouse in this case) is valid. There is no risk on loosing H4 status but I see issue in re-entry to US.