"But what if the parent hates and refuses traditional Catholic priests, wants Novus Ordo "sacraments" (such as receiving "communion" from a woman or other abominations), and has a Novus Ordo funeral. Is a child obliged to attend such a funeral?"

You are flat-out wrong about this.  The traditional Code of Canon Law expressly permits Catholics to attend non-Catholic weddings or funerals, so long as the Catholic does not actively participate.  There is no sin in it, and it does not offend God.  If this is permitted, they obviously attendance at a Novus Ordo funeral for one's own parent is permitted and there is no sin it in.
Making up non-existence sins is just as soul-crushing as laxity.

Wow such angry filth.  [READ: Righteous indignation]did I say anyone could do what they want?[Well, isn't that what is done during the Novus Ordos? Anything they want? and yet you voluntarily witness these sacrileges for no good reason, because there is no good reason, ever, for showing approval by your attendance at a sacrilege.] No.  Did I say God's honor to be ignored?[Well then, would you stand up and say something in protest?] No.  "Witnessing sacrilege in silence,"  What are you going to do? Protest your own father's funeral. [Absolutely,yes! Protest and boycott the sacrilege going on around his corpse. God first, not my father] The sacrilege and heresies of the NO exist regardless of the dainty pedestal you sit upon.[Correct. And you are not allowed to show your approval by being present when they are happening--silence gives consent.]  Ok, so he was not one of the 100k Traditional Catholics in the world.  Try thinking practically[No, I am thinking vertically and spiritually and you would be a better Catholic if you did the same] and not like a zealot.[Yes,sentimental,liberal backyard theologians always accuse Catholics who think vertically of fanaticism--you just choose to use the word "zealot" as a synonym for fanaticism. But remember Our Lord's words: "Anyone who loves mother or father or... more than Me is not worthy of Me." The humanists,atheists and liberals will call Our Lord a fanatic, nay, even a monster, for statements like this. You sound like you would be at least scandalized by it since you put "your" father's sacrilegeous funeral before the honor,dignity and respect we owe to God. FYI: Three things are necessary for a human act to be morally good--1) the act must be good in its nature, good in its 2) circuмstances and 3) good in its intention. If even one of these three are not fulfilled then the act is considered immoral. I am not questioning you on # 1 and 3. Only, only on #2--the circuмstances.]Like I said before:

I will not fault someone who chooses not to go to a Novus Ordo funeral service; however, it is perfectly Catholic to choose to go and not participate based on pre-Vatican II Church Law.  Until we have a true Lawgiver who states otherwise, it is appropriate for a Catholic to attend the Novus Ordo funeral.

Does the 1917 canon law permit one to passively attend the funeral of a christ hating Jєω yes or no?

Uh-huh...and quietly assent to the denial of the doctrine of Purgatory with the white vestments,flowers, humanistic eulogies, and instant canonization all the while. All you need is love. Wow. You sure sound like you killed your conscience, Vermont.

If the old Canon law states it allows passive attendance, then drop the holier than thou attitude.