I am truly sorry to hear of the loss of your mother. Our condolences.
There is a difference between grief and longing. You will always long for her presence, especially on days of importance, days of sorrow and days of hardship, but grief is temporary. You must accept grief as a part of the healing process, and you must accept the position that you are in.
Imām Sajjad (alayhi salam) taught us a number of different supplications. They are all found in The “As-Sahifa al-kamilah al-Sajjadiyya”, and also available at https://www.al-islam.org/sahifa-al-kamilah-sajjadiyya-imam-zain-ul-abide....
Imām ’Ali (alayhi salam) recited the following dua when he was sick:
The narrations say that there have been 124,000 prophets sent to mankind, which I take to mean 'an uncountable number'. The Qur'an says 'some of them you know, and some of them you don't know', so there have certainly been more than a selected few in the history of humanity.
With every station (or 'privilege') comes responsibility. How would you have felt having to face the army of Yazid, with the full responsibility of keeping the true Islam alive for humanity and for ever after?
It is one of your rights, but good communication (and a good marriage) is not build upon the demand of one's rights. One should always introduce one’s feelings, needs and desires in a proper way. This means that we explain our position with patience, tolerance and compassion. Moving to a new country is stressful for all, and there might be a reason for his lack of motivation to find a job. My best advice is therefore to tell him how you feel about living at your sister’s, and how it will improve your situation if he had a job.
Uttering falsehood is one of the major sins in Islam. Islam is a religion based on truth and therefore does not accept spreading of falsehood. In the Holy Qur'an believers are invited to "advice each other to the truth" (103:3). In the said case, it is incumbent for a Muslim to act upon the principle of enjoying good and forbidding evil.
It depends on the situation and your feelings towards her and her actions.
