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Your question is written with admirable/praiseworthy composure. The impression is you have practised the Dhamma very well; particularly from an originally challenging place.
I have previously answered a question at this link about the attitude towards authority figures found in the early scriptures.
Related to this, the scripture Iti 74 refers to the kind of son that is spiritually &/or morally superior to their parents.
In summary, the early scriptures are all about mutual obligations in relationship. While your compassion towards your father appears admirable, in Buddhism, there is an expectation a father must also abide with appropriate conduct before receiving full respect.
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A father-son (child) relation, good householder, is something which is based on debt in regard of the bound of the child toward to ones father and hard to ever pay off, but there is a way, as the Sublime Buddha taught: Parents
This kind of relation requires to fulfill ones duties, found in Sigalovada Sutta
Those duties could be abounded if one goes after higher, leaves home, family... for strive for Unbond.
Releation, in and off itself, with ones parents, would only "end" by change of ancestor-ship, meaning by reaching the path, yet still there is a matter of gratitude there, and sometimes wish of "repayment" is possible, sometimes not, sometimes one can not provide, sometimes the receiver wouldn't be able to take.
In regard of love, it's clear that such causes suffering, but that what is common seen as love is a desire or debt in regard of sensual pleasures and good to investigate whether ones undertaking to build up an active relation has "just" the purpose of possible pay depts really back or if one seeks for being provided by things, incl. identification.
As the topic is large and many things are to investigate, my person leaves it right here and, as parting is a matter one can not avoid, and maintaining relations is burdensome, maybe generally good to think in how far certain things open could be payed off and to leave not only a particular relation behind, but all, incl. that of the six senses, getting unbound, unrelated, someone really able to give.
And of course, relations need to be ended, if, with gratitude, for otherwise it would last, and the story wouldn't end.
A good talk on it: Karma & Gratitude
Since not really proper sphere here, good householder, one may feel given to investigate or ask further here.
A blessing: friends when the need arises.
A blessing: contentment with whatever there is.
Merit at the ending of life is a blessing.
A blessing: the abandoning of all suffering
& stress.
A blessing in the world: reverence to your mother.
A blessing: reverence to your father as well.
A blessing in the world: reverence to a contemplative.
A blessing: reverence for a brahman, too.
A blessing into old age is virtue.
A blessing: conviction established.
A blessing: discernment attained.
The non-doing of evil things is
a blessing.
[Note that this isn't given for stacks, exchange, other worldbinding trades or to nurish relations others then toward release, but food for an out of the wheel]