Grand parents doing aqeeqah for their grandchild

Q:

1. Should aqeeqah only be done by the child's father for it to be valid or can the child's grand parents do the aqeeqah if they want to out of love, even though the child's father can afford to do aqeeqah himself? Will the aqeeqah be valid in this case?

2. Will the grand parents have to take permission from the child's father if they want to do the aqeeqah? If they do it without his permission will the aqeeqah be valid or will the aqeeqah have to be done again by the father to be valid?

3. Suppose someone else, like any other relative, wants to do the aqeeqah, will they have to take permission from the child's father to do the aqeeqah?

Saying "Where is your Allah and only science can save the people from any disease?"

Q: I request clarification related to some words as to whether, Allah forgive, these are kufr. 

1. Saying in any gathering or discussion that " Nauzubillah some people / they (not specifically referred) are saying / believing that where is your Allah and that only science can save the people from any disease / corona virus etc; however our belief is that without almighty Allah nothing can save us". Does words expressed in start leads to kufr for one who quote these words in any discussion or gathering?

2. We sometimes feel that we are so much guilty and have done lots of sin and in fear we say words that " Don't know whether Allah will forgive me or not" though our belief is that Allah is most Merciful and Forgiving. Allah forgive, are these words kufr?

3. We sometimes feel that we have done lot of mistakes and wrong decisions in past though whatever happens is always in our betterment and already written in Taqdeer but we still feel lot of regret, sadness and hopeless and sometimes in that state of sadness and hopelessness someone says words like that" Its all due to his mistakes and wrong decisions related to job choice or other matters consequently he is regretting then then why should he say these mistakes / wrong decisions were due to Naseeb / from Allah". Allah forgive is saying these words Kufur? Nauzubillah intention was not to deny taqdeer.

I am very worried and confused and beg forgiveness and guidance from Almighty Allah. Can you please give some clarification in respects of above said words and other explanation related to kufr and Tajdeed Iman and Tajdeed Nikah?

Guardian of a child accepting distribution of an estate for the child

Q: I would like to ask about when a person dies and leaves behind inheritors: I have understood each inheritor gets part ownership in each item the person has left behind. Say for example that his spouse now owns 1/8 of every spoon, every chair etc he has left behind.

Rather than keeping shared ownership in everything, the inheritors will then generally agree to a distribution of the things amongst themselves. But if one inheritor is an underage child, who should accept the distribution on his behalf?

Also, the inheritors tend to agree to give certain things (such as clothes, books) in charity and throw away certain things that nobody wants. But a child cannot give his share away in charity. Does this mean that they would have to save all of these items until the child grows up before giving them away or throwing them away? Or is there any way around this?

Not reciting Surah Faatihah in the third and fourth rakaat of a fardh salaah

Q:

1. If a person intentionally does not recite surah fatiha in the third or fourth rakat of a fard prayer but stands for the duration of three subhanallahs or more and then goes into ruku will that person’s prayer be valid or invalid. And if that person stands for less than the duration of three subhanallahs and then goes into ruku will that person’s prayer be valid or invalid.

2. If a person forgets to recite surah fatiha in the third or fourth rakat of a fard prayer but stands for the duration of three subhanallahs or more and then goes into ruku will that person’s prayer be valid or invalid. And if that person stands for less than the duration of three subhanallahs and then goes into ruku will that person’s prayer be valid or invalid.