Nikaah & Marriage Issues

Q: How long after the nikaah can the walimah be held i.e. how many days after the nikaah?

Q: Is it permissible for father and son to get married to 2 sisters?

Q: I would like to know what portion of the husbands salary is the wife entitled to if the husband earns R40 000 after his taxes. The husband pays for all the household expenses. Apart from the normal household expenses is the wife entitled to her personal expenses from her husband. I hope this question is clear and I thank you in advance for your effort in this matter.

Q: What if someone commits zina with niece of his wife? Is the wife haram on him now? Will they be committing zina (husband and wife) if they don't leave?

Q: What is the Sunnah method of congratulating the bride and bridegroom on the occasion of nikaah?

Q: I am a 28 year old female and I  feel I am ready to complete half of my imaan. I recently received a proposal from a compatible partner whom I am inclined to and vice versa. he has also met with my parents and forwarded his proposal but when my dad learnt that  he is a shia (imami) muslim my dad has silently rejected the proposal. My dad promised that  he would get back to him with his answer but it's been almost a month now and  when I approached my dad wanting to know what he has decided and as to whether the boys parents could meet with my parents his response was that I must not rush him and he will give me an answer when he is ready.  A similar incident happend when I was younger and my father failed to respond to my proposal. I don't think this is fair on both of us as we are ready for marriage and want to do things the correct Islaamic way. Are there any grounds on which nikkah can be delayed if two individuals are ready and do not want to fall into sin please can you provide me with advice on what can be done in a situation like this.