Taking a false oath

Q: On the demand of my mother in law, I had to give 10 tolas of gold before marriage but I arranged for 7 tola and for rest, I was not financially strong so I made artificial gold bangles so that our marriage should not be affected. At that time I thought of making real gold when I will be able to make it.

Now our marriage has been done and its been 5 months and now her mother got to know that the bangles are artifical. So can I take false oath to save our marriage? Or what should I do? 

Paying profits of an investment in the same currency that one is doing business

Q:

1. If someone trading in jewellary, takes gold from someone as an investment into his business, does he have to return it in the form of gold or he has the option to return it as either gold or cash?

2. What if the initial deal was to return in the form of gold?

3. The price of gold has tremendously increased and he will return a huge amount (the gold he took as an investment does not exist anymore), so he either will pay the investors cash or gold, is this extra amount interest?

4. The investors gave him gold with a condition of getting a monthly profit, but in fact they were getting a monthly fixed amount regardless of the profit or loss. Is this fixed monthly payment interest?

5. Is it fine to take the orders to make jewellery and take some cash initially and at the time of delivery receive the rest or the whole deal should take place in one session?

6. What if the customer does not pay at the time he receives the jewellery and pays later, is it permissible?

Committing sins when feeling depressed

Q: Frequently I go into a depression whenever someone unjustifiably disgraces me or is unjust towards me. In such depressive states I often don't perform Salaah and start playing video games and watching YouTube movies. It is obviously very evil and haraam but I don't feel like making any Deeni effort at all. I will even make Wudhu but delay Salaah until the time expires.

I often feel: 'Why should I not attend a haraam function if my parents are just going to scream and be angry with me'; 'Why should I decline jobs if senior honoured 'Ulama are all themselves comfortable and participants of haraam images and banks' ; 'Why should I be careful about na-mahrams when every single Aalim in the family without exception lives and interferes freely with maids and na-mahram relatives,' etc. Please advise me.

Forgetting how many rakaats one performed

Q:

1. I usually take the least number of rakaats when I totaly get confused in the number of rakaats of salaah and complete my salaah. I don't sit for tashahud in every rakaat in this case but I do sajda e sahw in the end after reciting tashahud by saying salaam to the right side and then two prostration of forgetfulness and again tashahud then durood and dua and then salaam to right and left. Is this the right way?

2. If not, what is the ruling on my previous salaah?

3. If it is wrong what is the right procedure?

Tasbeeh-e-Faatimi

Q: In which tasbeeh do we have to recite durood, "Tawakkaltu alal hayyillazee la yamutu walhamdulillahillazee lam yattahiz waladan walam yakun lahu shareekun filmulki walam yakun lahu waliyyun minazzulli wa kabbirhu takbeera"

For this tasbeeh, do we need to recite durood before and after. Please guide me how to recite this tasbeeh and how to make dua.

Some partners taking more benefit than others in a property

Q: A family buy a property. In this property, some of the same family members, who bought the property, reside and some do not.

Because some family members are taking benefit from this house and some are not, do those who are taking benefit have to pay rent to those who are not? If those who are residing in the property have to pay rent, how will the rent be calculated?