Moving in ruku and jalsah

Q: In the Jalsa or Ruku in prayer, we have to stop for at least one Subhanallah, but do we have to sit in Jalsa completely motionless, or is it okay if we sit for at least one Subhanallah but in that time our arm moved a little or our leg(s) moved a little? The same question is for Ruku too, do we have to be completely motionless, or is it okay that we be in Ruku for at least one Subhanallah but during that time we move a little? 

Muslim girl taking consent from her non Muslim father or brother before getting married

Q: I want to marry a woman who has become Muslim, but her family is kafir. Her father is divorced from her mother and has not lived with him for more than 10 years and she lives with her mother and younger brother.

In this case does the girl need to ask permission or have the consent of someone from her family (Wali) or can she marry me only with her own consent?

Making a marriage public via social media by posting pictures of the couple to have more people to witness the nikaah

Q: Is it permissible to make a marriage public via social media?

For example, since a marriage must be made public, can I post a photo of my spouse and me together on Instagram since I will then have more than two witnesses? Does that meet the condition of making marriage public, which the Prophet insisted upon?

Shar'ee obligation of the father to provide maintenance for the children after divorce

Q: A couple have decided to terminate their nikah due to irreconcilable differences. After the iddat the wife will move out and rent a flat somewhere to accommodate herself and her three children (all sons).

Although the eldest child is 11, it has been mutually agreed that all 3 children will live with the mother.

The mother of the children has no personal income. She will have to find a job to take care of herself and her children as there is no other financial support. Since the children will be living with her, how much is the father liable for the maintenance of each child? Is there any formula to calculate this?

2. Which of the following aspects will be considered when calculating an amount for the maintenance of the children:

a) Food
b) Clothing
c) Rent
d) Utilities
e) Toiletries
f) Maid
g) Petrol allowance
h) Household detergents etc
i) Occasional treats

3. The children have grown up in a certain lifestyle. Does the mother have to cut back on what they are accustomed to, or does the father have to maintain them at the level they have become used to?

4. The mother will be moving into an empty flat which will have to be furnished with at least the basics. Since the children will be living with her, does the father have any responsibility in furnishing the home for his children's benefit?

5. The rental in an average suitable and safe area is around R6000. The children are already accustomed to living in such a suburb. Is the father obliged to provide maintenance considering such rental amount, or must the mother find a place in a sub economic area in order to afford the rental?

6. If the father of the children claims he is unable to afford, for example, more than R5000 in total per month for the maintenance of all three children, which is very inadequate, but the mother claims that he can afford more, how is this to be resolved?

Zakaat on gold less than nisaab

Q:

1. I wanted to ask if the only excess wealth a person has is a Kruger coin, is one liable for zakaat as it is less than 87 grams?

2. If a person has the cash that is more than the nisaab and also has gold in the form of 1 Kruger coin only, is zakaat liable on both the cash and the Kruger coin or only the cash?