Is it permissible to delay the disbursement of the remainder of a vow, stipulated to be for non-family members and designated to help poor young people marry, until after the vow-maker's marriage? And is it permissible to give a portion of this vow to needy siblings for marriage, or to the father and his wife, knowing that the intention was for the most impoverished? And is a vow considered a debt that must be fulfilled completely, and how is it calculated? And does the feeling of unhappiness when fulfilling the vow or the self-talk about poverty affect the reward?

Undertaking a vow is disliked (makrooh). What you have undertaken is a conditional vow, which becomes binding to fulfill if the condition it is tied to is met.

You must fulfill your vow. If its wording does not necessitate immediate fulfillment, you may delay it to prioritize matters of marriage or to assist your father and his wife.

It is not permissible to redirect the vow to your siblings or others to whom you did not intend to give it.

The vow becomes a debt upon you from the date you joined the work where your salary exceeded five thousand, and not from the time you are ready to fulfill it.

If you vowed to give charity with the absolute increase in salary, then you are obligated to give charity with every increase. If you only intended the increase on the initial salary, then nothing else is binding upon you.

Striving against oneself to fulfill the vow increases the reward, and feeling uneasy when giving out the vow does not diminish the reward, Allah willing.