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It's pretty easy and simple to apply:
 
Apply for a U.S. Visa | Business/Tourist Visa - Philippines (English) (ustraveldocs.com)

They are the Form DS-160 applicants. https://travel.state.gov/content/travel/en/us-visas/tourism-visit/visitor.html
 
Also Manila is not currently scheduling routine visa appointments: https://ph.usembassy.gov/visa-update-cancelation-of-b1-b2-business-tourist-visa-appointments-through-april-30-2021/

Send them an invite any way you would like
 
Once the US Embassy in Manila opens back up for tourist visa have them apply.
 
Senior parents tend to have a very high success rate at getting approved.

Marriage must be founded with pure understanding... It's not about how grand the wedding is but how you keep the marriage works. If he can't seem to afford a big wedding for now then you must understand him... Again it's not about being big and opulent but how you'll keep it sacred... Sometimes we must learn how to appreciate simple joys and blessings to see how true happiness really means Good luck and all the best to both of you <3

Marriage must be founded with pure understanding... It's not about how grand the wedding is but how you keep the marriage works. If he can't seem to afford a big wedding for now then you must understand him... Again it's not about being big and opulent but how you'll keep it sacred... Sometimes we must learn how to appreciate simple joys and blessings to see how true happiness really means Good luck and all the best to both of you <3

Marriage must be founded with pure understanding... It's not about how grand the wedding is but how you keep the marriage works. If he can't seem to afford a big wedding for now then you must understand him... Again it's not about being big and opulent but how you'll keep it sacred... Sometimes we must learn how to appreciate simple joys and blessings to see how true happiness really means Good luck and all the best to both of you <3

Marriage must be founded with pure understanding... It's not about how grand the wedding is but how you keep the marriage works. If he can't seem to afford a big wedding for now then you must understand him... Again it's not about being big and opulent but how you'll keep it sacred... Sometimes we must learn how to appreciate simple joys and blessings to see how true happiness really means Good luck and all the best to both of you <3

Marriage must be founded with pure understanding... It's not about how grand the wedding is but how you keep the marriage works. If he can't seem to afford a big wedding for now then you must understand him... Again it's not about being big and opulent but how you'll keep it sacred... Sometimes we must learn how to appreciate simple joys and blessings to see how true happiness really means Good luck and all the best to both of you <3

Marriage must be founded with pure understanding... It's not about how grand the wedding is but how you keep the marriage works. If he can't seem to afford a big wedding for now then you must understand him... Again it's not about being big and opulent but how you'll keep it sacred... Sometimes we must learn how to appreciate simple joys and blessings to see how true happiness really means Good luck and all the best to both of you <3

Marriage must be founded with pure understanding... It's not about how grand the wedding is but how you keep the marriage works. If he can't seem to afford a big wedding for now then you must understand him... Again it's not about being big and opulent but how you'll keep it sacred... Sometimes we must learn how to appreciate simple joys and blessings to see how true happiness really means Good luck and all the best to both of you <3

Marriage must be founded with pure understanding... It's not about how grand the wedding is but how you keep the marriage works. If he can't seem to afford a big wedding for now then you must understand him... Again it's not about being big and opulent but how you'll keep it sacred... Sometimes we must learn how to appreciate simple joys and blessings to see how true happiness really means Good luck and all the best to both of you <3

CR1- less than 2 years of marriage
IR1- Married for more than 2 years