Angela Suleman said she thinks that time is now.
"He must have really liked her a lot, been in love with her," she said. "How else would someone do this? Have his own children run around and not be a part of their life? Though she did say he would be part of their lives later. But this is an important time and they should have a father now."
Nadya Suleman married Marcos Guittierez in 1996 but the couple separated in 2000. They divorced last year and court records indicate no children were produced.
When they learned of their daughter's plans to seek a second in vitro fertilization procedure, Angela Suleman said she and her husband intervened with doctors.
"We said, 'She's not marr[ied], she wants children and she really does not have any means to support them and she really shouldn't have more, that's enough,'" she said.
So, she said, Nadya Suleman's original IVF doctor "didn't implant any more embryos and we're thankful for that."
"But she went somewhere else and someone else did, so now she has eight more," Angela Suleman said. "How she's going to support them, I don't know."
Angela Suleman said her daughter was induced after 7½ months because one of the fetuses was so high up in her womb that it was cracking a rib and doctors were concerned the baby wasn't getting enough oxygen.
Nadya Suleman has a 2006 degree in child and adolescent development from Cal State Fullerton, and as late as spring 2008, she was studying for a master's degree in counseling, a school representative said.
"She really has no idea what she's doing to her children and to me," Angela Suleman said.
The challenges of raising 14 children younger than 8 as a single mother are daunting.
Costs for the average delivery of a full-term pregnancy range from $9,000 to $25,000, depending on whether the baby is delivered by Caesarean section or vaginally, experts told ABC News.
It remains unclear how Nadya Suleman plans to pay for the children's upbringing. Her mother told Radaronline.com that while she dearly loves her six grandchildren, she is at the end of her emotional and financial rope.
"I'm really tired of taking care of those six,'' she said. "I really need [Nadya Suleman] to think of what she's going to do and how she's going to provide for all these children."
Angela Suleman and her husband live with their daughter and the six grandchildren in a "humble, three-bedroom home,''' she said.
"We're there all crowded in. The master bedroom has a big bed and two little cribs and the other bedroom has one bed and one crib and there is one bedroom with bunk beds that I [had] gotten before, so it's pretty crowded. But [the children] are wonderful, beautiful children and I love them dearly. I would never let anything happen to them, so I'm taking care of them and I have been."
"I don't know what the future will bring, because, hopefully [Nadya Suleman] will get some living accommodations -- because it's a really small house."
Angela Suleman described her daughter as irresponsible with money and unresponsive to her retired mother's financial needs.